Link didn't load for me, but at least I can say that I agree with the title.

I type reasonably fast (about 120 WPM on a good day, 100 WPM on a normal day, according to Monkeytype), but I've said for quite awhile that you get around 95% of the benefit of fast typing by simply getting to 50 WPM.

I do think that there's value in being able to touch-type, but I think the benefits after that tail-off pretty quickly.

Getting faster at typing is fun, and it won't "hurt" you or anything, but like many things, I think a lot of the benefits are overhyped.