I think
pokerstars will not do this.
All they can do
Prohibited:
1.3) ... There are qualitative restrictions on any statistics displayed in the game, for example, the impossibility of dividing it based on the strength of your hand. There are also restrictions on the functions of programs that display statistics regarding the impossibility of automatically changing the displayed data depending on the state of the game or the trends of opponents.
HUDs cannot dynamically change depending on any information about the current state of the game, except for the format of the game or nicknames of opponents. For example, changing statistics displayed based on the size of the stack or position at the table is prohibited.
It is allowed to use ordinary static HUDs, which do not change during the distribution.
Objectively, the question should be raised not about the prohibition of the HUD, but about the prohibition of positional and dynamic HUDs.
What essentially PokerStars did.