The issue isn't the suspension in and of itself. It's the total lack of consistency. I could be wrong, but to the best of my recollection, other bad hits thrown in the playoffs in recent years have rarely been punished to this degree, even when it's a repeat offender involved - which Bunting isn't.
I don't believe that the league has it in for Toronto. Back in 2021, Bettman even took the rare step of going against the DoPS and reducing Jason Spezza's suspension from 6 games to 4. I do think it's a possibility that Parros may have a personal vendetta against the Leafs (though even then, the phrase "never attribute to malice that which is adequately explained by stupidity" likely applies here). Either way, it is somewhat baffling that the league continues to let a mush-brained walking vegetable like Parros run the DoPS.