I mean does this distinction matter? Buying a book no one reads is a pretty dubious value proposition either way.
My issue is the DMG simply doesn't address the issues facing it's only reasonable audience, new DMs. It, instead, offers vague platitudes and meaningless conjecture while regurgitating freely available community advice.
And now, in exchange for optional rules and monster creation math, we get, what was in the UA, a poorly designed and balanced board game that serves as an excuse for the DM to take a sandwich break.
Unless this revision has seriously upgraded it's content, the DMG needs either a complete reboot or to be merged with the other core books. That way people can, in my opinion, stop wasting money on what should be called "Volo's guide to fluff."
If you want a DMG, buy Kobold Press' or Level up's equivalent. Both of those have actual content in them. I cannot imagine someone actually gets $50 of value out of this book.
But I have been called a WotC fanboy recently, so maybe I'd just tired and confused.