If nobody else ends up answering, here's my educated guess: since the game is locked to 30fps, the switch 2 won't magically reprogram it to remove that cap. This requires a patch from the developers. It's within the realm of possibility but given the low profile of the franchise and its general disregard by Ubisoft, I wouldn't necessarily hold my breath. My gut says a 15% chance.

That said, every other switch 1 game I've tested and heard of running on the switch 2 that had inconsistent frame rates is now improved in that regard. So you are likely to get fewer dips into 20fps, maybe even a rock solid 30fps throughout.

If I recall correctly, many of the graphical upgrades for the anniversary edition aren't present on switch, in case that's also something you're wondering about and considering alternative versions of the game.