Nonsense. Leicester failed because they couldn't afford to keep their players, because their owners suffered a lot from Covid. They gambled it all (especially in the 2nd year) in the Champions Leagur qualification but they couldn't make it. It's why players like Maddison, Tielemans etc. decided to leave, because they could've gotten better contracts at more healthy clubs.Leicester are a case in point. They miracled their way onto the top table, tried manfully to compete, gambled on recruitment working out, couldn't keep up and now look at them.
To cover their recruitment they had to sell their best players to teams they were trying to catch. Thus weakening themselves, and strengthening their quarry. When their gambles didn't pay off, they were fucked. They had players on big wages (inflated to convince them to join a non-elite side), who had either proven not to work or not been proven to work.
They didn't sell anybody of note apart from Chillwell and Maguire, and they didn't even suffer their sale because they finished 5th the season after they sold them (where they completely fumbled UCL qualification).
Villa are in interesting case, because they benefited greatly from the Grealish sale. As brilliant as he was, they were able to build a squad from him. West Ham want to do the same with Declan Rice.