There is nothing wrong with him saying the team lacks mentality. That's pretty obvious.
To further the article they say that the plan is for Alves to stay until the winter market to work hard playing here and make the Brazil squad, then possibly let him go after January.
I could see him retiring after World Cup.
Imagine Alves at 38 making the Brazil squad for the World Cup...football has regressed badly.
Not really. These days players who are professional and keep care of their bodies can prolong their careers and play on a top level deep into their thirties. Modrić will turn 37 in September and is still playing great, Benz should win Ballon d'Or at 34.
Just because we have players like Busi who really should have retired 4 years ago doesn't mean players in other clubs who are older than him don't still play good to even great.
Alves has always been a hardworking professional unlike many Brazilian offensive stars like Ronaldinho or Neymar whose life style (partying) eventually affected/shortened their careers. And coaches also value his personality in locker room.