Nope, B is officially supposed to be left hand. B is equidistance from both index fingers. Y is closer to the right than the left.
B is very commonly typed with the right hand, though, just because so many people are right handed. I'm weird with it, and use both fingers, depending on what word I'm typing and if the other hand is more busy.
For those interested, there's a lemmy community for the pi pico from the same mods as r/raspberrypipico.
https://lemmy.ml/c/raspberrypipico
(if you're viewing from a different instance, just drop that link in the search and if it doesn't show up the first time, try again in a few minutes and it'll show up after it's sync'd to your instance)