That's true, but it's irrelevant to the point. Listing DHH as one of the "creators" of Ruby, like this article does, needlessly spreads misinformation. Frankly, it's not fair to Matz and the Ruby dev team to list DHH as a creator of the language. DHH invented a web framework that greatly popularized the language, true, but Ruby was single-handedly created by Matz.

BTW, not everyone who uses Ruby uses Rails. Ruby is a general purpose programming language that is used by many people for solving many different problems.