I don't think its common for clubs to give daily/weekly detailed information on injured players. But in this case there actually has been some detail given, not much but some. The club posted this statement in October for example:
https://www.manutd.com/en/news/detail/paul-pogba-ruled-out-for-a-month-due-to-injury
And after the Arsenal match Solskjær stated quite clearly that after getting a second opinion, Pogba and his team decided that it would be best to have another operation ASAP, so he'll be out for another month or so now.
Also, if I remember correctly when Shaw and Martial dealt with injuries for a few weeks we weren't given much detail on their injuries either. Martial was originally slated to be out for about a month, but it actually took him two months to recover from his injuries. Shaw even longer. We haven't been given much detail on McTominay's injury either, first it was "a few weeks" and then all of a sudden he'll be out for "a few months".
He doesn't "live on social media". He doesn't even post that much anymore, if you check his Instagram you'll see he rarely posts pictures more than twice a week. He's a family man so a lot of his pictures are of his brothers, girlfriend and their young child. That's pretty normal. Most people on social media post pictures like that. Every now and then there are sponsored posts but they're not that many, and I doubt Pogba himself posts the sponsored pictures, that's probaly his PR team that take care of those.
Also he's posted a few videos of himself during the rehab. Which to me says he was been working on his fitness and getting back. He doesn't have to give out an official statement on a regular basis, he posted a couple of videos exercising, that should be enough. Just let him just focus on his rehab in peace.
Raiola always talks shit. I'm not sure what you want Pogba to do, he isn't Raiola's mother. It's not Pogba's job to put him on a leash he says something you don't like.
He didn't "feck off to France", he did a charity event with the clubs permission.
Lastly, I don't think he'll talk shite about the club when he leaves. He didn't talk shite about us while he was at Juve and he hasn't talked shite about Juve since re-signing for us. And as far as I know he hasn't spoken shite about any former or current teammate. Believe it or not Pogba is actually a professional and respectful individual, he's not this evil cartoon villain person you think he is.