In my opinion, it would be really weird of Matuidi just "randomly" joking about Pogba coming back. Their reactions say it all imo.
Pogba in Juventus was two years ago, people don't think about him and Juve anymore like maybe one year ago, so why the hell would Matuidi randomly bring up Juventus from nowhere, two years after Pogba left us?
I definitely think there is something in this. I remember refusing Pogba would leave two summers ago while being on holiday in Greece, I was like: "Guys, haven't you seen the interview with Evra?!" and writing this at the actual moment, I'm thinking about that exact interview. Do you guys remember when Evra and Pogba had an interview during Euro 2016? Evra was joking about how they will come back to Vinovo etc, Pogba seemed so much more sure that he would be in Vinovo than this video (not Vinovo but..), this video with Matuidi is really strange!