Hm, not really. They say "Developers often use W3Schools only because it is at the top of search results." If so, that is nothing to blame the site for; developers should rather learn how to use search engines then. I don’t see why being the first result disqualifies a website as a reference. They also say other sites were "more reputable sources". If the statements of W3Fools is correct, W3Schools were the pioneers of web-based documentations for developers, so that’s why they are popular throughout Google. I don’t see the problem about this.
They say "Developers often use W3Schools only because it is at the top of search results." If so, that is nothing to blame the site for; developers should rather learn how to use search engines then. I don’t see why being the first result disqualifies a website as a reference. They also say other sites were "more reputable sources". If the statements of W3Fools is correct, W3Schools were the pioneers of web-based documentations for developers, so that’s why they are popular throughout Google. I don’t see the problem about this.