https://www.football-espana.net/2021/09/03/riquelme-lionel-messi-barcelona-prediction
https://www.marca.com/en/football/psg/2021/09/03/61323d88268e3e6e4f8b4608.html
Many news sites have shared news about it. I've written a few of them, you can check them out. In general, news sites also copy news content from each other
Messi is one of the most professional football players in the world. Leaving Barcelona was a different situation, maybe he could retire there. I'm sure he'll want to come back too. We will see what he will do
I am 100% sure that Messi will return to Barcelona, but the question is what his function will be by then? He could probably become president whenever he wants. Or manager or whatever else there is.
The situation where Messi leaves PSG already next year would probably arise when Mbappe leaves, and even Neymar leaves for another club. I doubt that Messi would stay then. On the other hand there are so many things that can happen next year. It is also the World Cup year. I expect Messi to take his time regarding the option to extend his contract with PSG, but well, the World Cup is in Winter so he has to make his decision before that. It is going to be a weird soccer year for all of us anyway.