I don't know, I'm not the one who made the claim that X was faster than Y.

Are you saying that studying how efficient various text editors are for some groups of people is not possible?

Here's what I believe to be an example of some study on how text editors compare:

https://mjambon.github.io/vim-vs-emacs/

Not saying that this is a good study - I haven't even read it. Merely providing it as an example that at some point a study has been made in this area.