Photo is a little misleading. I've seen video of him recently. He's mostly just overweight right now. It's to be expected considering he hasn't been able to run.
I'm still betting on embiid being fine, though. I followed his situation way too closely this offseason. Philly hasn't been open about what is going on there... They flat out lied about what was happening... It still hasn't been confirmed if he rebroke anything... So all you can really do is guess. But based on everything I've read, my guess is he could have played this season and probably WANTED to play this season, but philly wasnt comfortable with the level of healing... So they had him get a bone graft to maximize his chances of long term health. Someone can look it up if they care, but I read some speculating yesterday that embiid's original surgery took place before he was drafted. Is that true? They were speculating that philly probably would have had him get a bone graft initially had he been on the team when the original surgery took place.
Who knows, though. That situation is bizarre. I expect to see embiid play next year.