Every player has the 'potential' to break PL betting rules. It's absolutely impossible to predict whether or not a player will break the rules in the future, and near impossible for the buying club to identify whether or not they have in the past.
As it may relate to a match played in March 2023, it is likely that enquiries raised in the Paqueta case will have taken some time. As such, the information now available almost certainly involves (very) recently identified evidence that has, quite rightly, been brought to the attention of all parties.
It's the tip of a huge iceberg. Of course, there are honest players. However, it would be incredibly naive to think that no current City players (or none of those from any club) are breaching betting rules on a regular basis.
Gambling is an addiction. Sportsmen/women aren't exempt.