I think Messi is trying to be realistic now and he didn't want to make a blunder that would put him in the same situation a second time. We all know that he left Barcelona because Barcelona's financial situation was in turmoil and Barcelona has no option other than having to sell Messi. So if Messi has worries about returning to Barcelona, I think it is a reasonable thought because even though 2 years have passed, Barcelona still has problems with their finances and Messi knows the problem perfectly.
When it comes to contracts and his standing in clubs, Leo Messi is extremely sensitive. Barcelona have yet to provide a solution to their financial problems, which is the main reason Leo Messi left Camp Nou in the first place. Making a U-turn back to Barcelona in the last few days has a higher probability, but his father, Jorge Messi met with barcà president, Joan Laporta, and the deal collapsed for complicated reasons. I'm guessing Leo Messi doesn't want to be tied down by the club's financial problems, which are forcing players to accept pay cuts; he's worth more than that. For Herons vice city fans, moving to Inter Miami is a dream come true.
Going back to Barcelona is not a solution for Lionel Messi so I would prefer him to go to another team, and he did go to Miami for his new season. Paris Saint Germain no longer provides comfort so he really has to leave. Barcelona still really want him, but it seems that both parties have not found an agreement that benefits both parties.