That is true, but if the website is meant to be used as a resource then it should be designed to be easy to use and implement instead of having to look at the website's actual source html to get a feature working
They were giving pretty reasonable and, I dare say, obvious feedback. The site should provide an HTML snippet like just about every other demo page out there.
I can't see the author disagreeing with that.
You could copy and paste your "fuck them, right? /s" snark on just about every bit of feedback everywhere. I don't think that's very constructive, and it demonstrates a misreading of the parent comment.