OK, I think I see how it works, after Stretching Lillard, they are at about $118M with active contracts and holds for Trent, Porter, and Prince. Add Turner ($24.9M) and they are at about $143M, under the cap so allowable. Then they can go over the cap to resign their own players (convert holds to contracts).
I don't like their roster though. I don't think they will be that good. Maybe they need to consider Kuzma for Simons? Does MIL have any first round picks to trade?