I don't understand why you are hung up on how the date is expressed.
The only thing that matters is that there is a date, after which if the player is still on the roster (i.e., he has not been terminated) then the non-guaranteed portion of the compensation that is conditional becomes vested.
There is a specified procedure for termination that all contracts conform to, and that includes first requesting waivers. Until the player gets through waivers, his contract is not terminated. So the important point is that he has to be put on waivers before that vesting date, if you are trying to get out of paying him the non-guaranteed money.
Here, I dug it up. Section 16.f of
http://static.basket-infos.com/wp-content/uploads/2013/07/Contrat-NBA1.pdf
(f) If the Team proposes to terminate this Contract in accordance with subparagraph (a) of this paragraph 16, it must first comply with the following waiver procedure:
(i) The Team shall request the NBA Commissioner to request waivers from all other clubs. Such waiver request may not be withdrawn.
(ii) Upon receipt of the waiver request, any other team may claim assignment of this Contract at such waiver price as may be fixed by the League, the priority of claims to be determined in accordance with the NBA Constitution and By- Laws.
(iii) If this Contract is so claimed, the Team agrees that it shall, upon the assignment of this Contract to the claiming team, notify the Player of such assignment as provided in paragraph 10(c) hereof, and the Player agrees he shall report to the assignee team as provided in said paragraph 10(c).
(iv) If the Contract is not claimed prior to the expiration of the waiver period, it shall terminate and the Team shall promptly deliver written notice of termination to the Player.
A-10
(v) The NBA shall promptly notify the Players Association of the disposition of any waiver request.
(vi) To the extent not inconsistent with the foregoing provisions of this subparagraph (f), the waiver procedures set forth in the NBA Constitution and By-Laws, a copy of which, as in effect on the date of this Contract, is attached hereto, shall govern.
(g) Upon any termination of this Contract by the Player, all obligations of the Team to pay Compensation shall cease on the date of termination, except the obligation of the Team to pay the Player’s Compensation to said date.
I'm hung up on it because nothing addresses the specific scenario. All we have are assumptions based on somewhat similar situations but not really identical. Even through what you posted, which I had read prior to this, doesn't necessarily addresses the situation. I'm hung up on it because people who are quite adept at the CBA AND have access to how contracts are written say most contracts are worded in such a way that contradicts what it means of when a non-guaranteed contract becomes guaranteed (which at the same time I recognize might be at odds with what is said above). I get hung up on it because the CBA rules don't go into specifics on what AMENDMENTS can be included to the standard contracts and the nature of them, the specifics of them, and how they affect AND challenge the understanding of the paragraph above.
And I'm not really hung up on this per se. I'm just not ready to swear by as a definite something that is by it nature quite vague and unclear at the moment. With that in mind I simply lean into what local reporters say in part (since they had to get the "need to make decision by" from somewhere, sometimes likely from front office personnel) & from what seemingly quite a few CBA Gurus (though I lean on Pincus for this) I completely trust seem to say and insinuate.
Even if their interpretation is false, I also question if the date propagated IS the actual date of when the guaranteed contract is. Without seeing the specific contract, we don't know what date is mentioned in the contract. For all we know the contract could say July 10, but for simplicity the date that is leaked to the media is that of July 7 so that it's easy to digest the "by when a decision needs to be made". But again, this is even if I allow myself to side with your interpretation. And understand, I'm not dismissing it, I'm just not ready to blindly take it as definite when there are other experts of the CBA that seem to disagree with this assessment, particularly with non guarantees that have target dates instead of defaulting to January 10 (furthermore, dates that occur prior to the season starting and during free-agency period).
Anyways, all I've been trying to say is that let yourselves be open to the possibility that we don't have access to everything that may go on in a contract and for the possibility that there may be ways to make terms on a contract that challenges our previous understanding of what is declared in the CBA.