For you and many other developers-- so it helps them do the right thing in following web standards if they at least get reminded of it when learning new stuff.
Looking at brothercake’s article, it sure looks like it’s more work at the moment. It does still use the native HTML5 API, just adds some other things on top of it. So I’d call it “Modified HTML5 Drag and Drop”.
In any case, I don’t necessarily expect the author of the more recent article to add in all the keyboard stuff, as it’s trying to stick more to the basics of the API, but I do expect a mention and maybe a link to the other SitePoint article.