I completely believe this. And I think it's more than reasonable to think that Lebron "ordered the hit" so to speak. Just watch Lebron during that entire scuffle. It's like he knew it was going to happen, he had no issue with it, and made no attempt to split it up.
Just for clarification, I think this is specifically about Perk. The JR Smith smack I think was it's own incident and not technically connected to the Perk hit. But the screen and stare-down afterwards by Perk? I thought it initially, but now seeing what Max said? I think it's totally realistic and more likely than unlikely