His off the pitch actions have been quite extensively documented actually! It's not exactly hidden that it's a source of great frustration for City. Most recently a whole several hours late for physio for example. It doesnt take a genius to realise Pep's comments were a subtle push to that...
Edit - for example, a lack of focus affects injury recovery time. Turning up late to rehab, partying and messing about too much (when you probs should rest) - even the legging it onto the pitch with a dodgy knee. Funny, yeah, but come on. He did that just to film it for Instagram and the physios were probably fuming. And that's only the stuff we see.
He's liked, defo, but it's easy to see why many think he doesn't take it all seriously.