That quote is taken out of context and was written by someone who's first language is obviously not English. I took the paragraph to mean that Emacs users are possibly more technical because it attracts those who are curious enough to research less mainstream programming languages.
The entire paragraph is about Lisp if you read carefully. The mother tongue of the author is irrelevant, he clearly thinks that Lisp is a superior language for a possibly more intelligent coder:
Emacs is developed by Lisp whose syntax is different from common programming languages. A developer who is curious enough to try Lisp is possibly more intelligent than average. Lisp is often the third language he/she learns (Java/C/C# is the first, a script language like Bash/Python/Perl/Ruby is the second).
