Sounds like bullshit then. No idea why you feel the need to advance such a narrative against Messi.
Other than that it's open season in Barcelona: Umtiti, Pjanic, Coutinho, Junior, Braithwaite and possibly Roberto and Dembele should all be gone. Most of them high earners as you said. Still think it won't be enough for Messi to stay though without doing something shady, which I am against.
Well... we can't get rid of Dembele and I doubt we can get rid of Coutinho due to him only coming back from a long injury. I doubt Junior and Braithwaite would be that much. In any case, not sure how we're going to get below the salary cap to keep Messi here. Unless we sell Griezmann, de Jong, Dembele, Coutinho, Busquets, Alba and Pique, which is never going to happen. They're realistically only the players we can release/sell/loan who can put us under the salary cap.... and we'd probably have to get rid of most if not all of them to achieve it.
Barotmeu thought he was doing us a favour by keeping Messi here for one more year, but releasing Messi last season would have helped us out so much. Could have save 134m from his salary, another 33m from his loyalty fee, got a potential 50m to 70m for a transfer fee for him, then saved another 20m to 30m from his signing-on fee if he resigns, then saved another 120m euros for the next 2 years. All in all, we could be saving around 400m euros. I get Messi used to bring in a lot of money for the club, but that changed once COVID hit. I doubt Messi has brought in anywhere close to what he used to in the past 18 months.
Grim times ahead.