This honestly sounds like a humblebrag to me.
Typing on a keyboard is not a drop-in replacement for the act of writing by hand. It has very different effects on the brain and how it engages with what is being written.
If I'm working out difficult problems, in the early stages I much prefer a combination of doodling and handwriting over typing stuff on the computer. It actively engages the mind in a way the keyboard does not. Typing really only works best when the problem solution is already present semi-finished thoughts in my head and just needs to be fixated in external symbols, with a little bit of restructuring along the way.
Basically: I prefer handwriting for thinking, and typing for transcription.