It would be one thing if he was doing this and not showing up to offseason training but so far he seemingly hasn’t missed an offseason practice so I’m sure he’s spending as much time on football as he always has, he’s just spending the rest of his time differently. People will clown him but he probably doesn’t care because he doesn’t see how he plays as related to his relationship
I'm sorry maybe I'm misunderstanding, but I don't think anyone thinks he's not working? I mean, he clearly is. (Even then OSP are entirely optional so he's not beholden to attend them either really, but the optics would be pretty iffy).
But, yes, people (myself included) have made the point that rival fans and the media will clown him if the Chargers have a bad season and will absolutely use this as ammo. It's also fair to say that this may be awkward for both of them if they end up splitting in the future.
However, as I said, he's a grown man who can make his own decisions and I'm sure can factor these possibilities into his decision-making and/or simply doesn't care. At the end of the day, it's not a big deal imho.