Isn’t the issue here that although he may not be guilty of anything criminal he may have crossed the line in terms of how MUFC expect their Employees to conduct themselves and not bring the club into disrepute and bring bad publicity.
All this is likely to have been written into his Contract and all other players. Ditto RUFC I would have thought.

Salacious albeit not breaking the law isn’t acceptable

They’ve cut ties with him so they must be confident the player can’t challenge what they’ve done