All I'm saying is that if the way somebody performs against an opponent contradicts the level they have been portrayed at, it's considered PIS.
The notion that Vader not ragdolling Rebels Ahsoka would be PIS because it contradicts the combative level already established for Ahsoka doesn't make sense since Rebels Ahsoka's level as a combatant has not been established yet. It's been several years since the Clone Wars. For all we know Ahsoka could still be beneath Ventress level, or she could've risen to above Maul or Dooku level.
I'm not arguing she's Vader's peer, especially not in TK. I'm just saying how she performs against Vader, whether well or terribly, wouldn't contradict what we know of Rebels Ahsoka as a combatant since we really don't know very much about Rebels Ahsoka as a combatant.
I doubt Ahsoka is going to wind up being Vader's peer, but her combative ability at this point in time is not established enough for her fight with Vader to contradict anything.