LogFAQs > #905310650

According to this, it's basically a non-option for him to hold out:

https://uproxx.com/dimemag/kawhi-leonard-toronto-raptors-trade-refuse-play-sit-out-cba-rules-contract/2/

He'd lose all his salary and Toronto would still have control of him. I guess he could fake an injury the whole year? That would really tank his free agency value though, teams are going to want to see recent evidence that he's the same player. It would also be a further hit to his image. He's pretty much in a lose-lose situation but I think at this point he needs to just bear it for a year and get his people to shut the hell up so he can rehab his image.