This reminds me of how a lot of top video game speedrunners (e.g. Portal) are professional musicians because they are very good with accurate timings lol

There's also some anecdata floating around in the -- what would you call it, the "competitive speed typing" community? Or "people who play TypeRacer a lot". Some seemingly significant correlation between skill in typing and piano. Or at least the appearance of skilled typists having some interest or experience in piano. This could probably be generalized to being good at fingering or timing, or maybe even further, to having effective mindsets or attitudes regarding performance of skills (like the need for a presumptive confidence of sorts), or being aware of good practice methods.

I accept your hypothesis, but allow me to suggest an alternative hypothesis for you to consider (and maybe reject after consideration).

I am in my late 40s. Modern videogames are a great deal easier than games I played as a child. I tried playing a few games from my mispent youth recently, and was absolutely amazed at just how much harder they were.

FWIW, I also play music, mostly guitar.