That article says Tose was forced to sell the Eagles because of his gambling debts, not because the NFL made him sell the team.
Back then Gambling was not allowed by anyone in the game, that’s what caused the NFL to force him to sell. True he was in debt and had to sell, but the NFL has rules on how much debt a team can take on, he could have taken out loans to pay off the debts, but the NFL probably put a stop to that.
Now the NFL is practically in the bookmaking business.