Sure, and what's next? Sentences? Paragraphs? Let me just proudly display an entire chapter on my storefront, because it has every possible keyword related to my business, and I bow to SEO. Keep in mind, there's a limit of 63 characters. But don't let that hold us back.
I don't discount some long-tails, they can be catchy and memorable. But I think we're getting a little ridiculous now, informing people to just make their domains longer and longer all to feed the .com engine. I'm assuming that's what the article is referencing to. Because I'm not seeing consideration being given to the stronger, more relevant domains available now, using NEW extensions that are keyword-rich and brand-specific, meanwhile keeping the domain name SHORT and SWEET. This is what helps connect with buyers.
In terms of "super relevancy", well the more words you need to describe something, the less relevant it becomes, because it loses its brand appeal.
So, lets move away from this long-tail crap, and embrace whats right in front of us. Your buyers will thank you.