Check out badge 8 - it's CSS3 specifically. Who knows what the icon is, but still.
For example, you could have a Javscript coder always having to explain that he uses "HTML5" technologies but is not well-versed in actual HTML5 markup, which may not be required. I've seen numerous job listings where the person writing the job description is obviously absolutely confused over what they need.
I'm not saying that Web3.0 is an appropriate term. I just would have preferred that a more general term was used to describe all the technologies as a whole. Referring to all of them by the name of one of them is a mistake. Especially since it seems that some are pushing the notion that HTML shouldn't have a version number to begin with.
But otherwise, what is going on here is that Mozilla is part of WHATWG, who is largely responsible for the success of HTML5. WC3 actually wanted to drop support for HTML (calling it done) and only within the last year decided to jump in the bandwagon and take credit. And then along the way, get things wrong - like this list of the Mozilla page.
I've always said, "to clients, it's ALL HTML5, but to developers, we should know the difference". But the WC3 is clouding that difference.