The data shows VS Code is used by double digit % of developers, whereas Emacs is less than 1%, I think that qualifies for most.
Yes, Emacs is not popular, but if you look deeper, you may find unsurprisingly that most Emacs coders are strong developers. That correlation isn't coincidental - you don't stick with Emacs unless you're willing to learn; it effectively teaches you about Lisp, extensibility, and programming in general.
Yet, they are not talking about general popularity of editors among devs, but about people who ever tried Emacs - the argument is that the majority of them try, fail and abandon it. For which obviously there's no polemical (or otherwise) data points.