Absolutely to all of this. In any meaningful usage of the word, this is a new typical edition being worked on. But not a new game, which is what WotC tried to make the word mean (not that theybwrre consistent!). In reasonable terms, this is approximately the 15th Edition of D&D, including OD&D, the BD&D typical editions, 3.5, and 4E Essentials as what they are in publishing terms: distinct typical editions.
So I have a problem with this, because, maybe I'm misremembering, but my recollection of 4E Essentials is that there were literally no actual general rules changes (though I admit this may be difficult to track with 4E's constant updates).
At all.
And all that Essentials did was add yet more takes on classes/abilities. Some of them were further from the AEDU structure, but still not entirely alienated from it, and they worked literally 100% perfectly with existing material.
So that idea that the Essentials books were either a new "edition" or a new "version" kind of falls flat. It's actually just a pair of splatbooks
hyped as a new version/edition. That's been done before in games of various kinds, particularly board* and war games, where they have the "original" format, then later you get stand-alone add-ons, that either can be played by themselves, or are 100% compatible with the original game. I feel like even thinking it's an edition or version in a meaningful way is just buying into the hype.
If I'm wrong and there were general rules changes, please correct me.
That's a fundamentally different approach to 3.5E, which changed fundamental rules, revised existing classes (rather than providing new-but-compatible takes, which even had their own names to cleanly separate them and make them run well at the same table), and generally re-worked the game. It's also different form a lot of older ('70s and '80s) updates, where there was no clean intent to have an "edition change", just they kept changing/updating the rules and saw nothing wrong with doing that and not highlighting it, and just letting DMs deal with the consequences.
As an aside, I don't buy the OP's "skunked term" super-hot take (which is spicier than the very people he attempts to criticise), and is a pretty bad concept even in linguistics. Edition isn't changing in meaning. Edition in RPGs means what it's always mean, and this is clearly 6E (based on the current rate of change). The problem as you say, isn't this edition change at all, rather it's the 2E-3E, 3E-4E, and 4E-5E changes, all of which weren't mere "edition changes" in RPG parlance, but major re-writes, which with other games, ones less brand-reliant, might have even meant giving the product a new name. I don't really want to propose those names, because I'm not a name guy (and honestly I don't WotC are particularly good at names either), but 3E could easily have been called something like D&D 2000, or um, dare I say it "D&D: A New Era" (kill me now), if it was a lesser-known game. What was weird was trying to call THAT 3rd edition, not calling THIS 6th edition.
* = Tons of modern board games do this and it's actually a hot topic with board game fans. Dominion has a ton of stand-alone expansions, for example, which you can mix-and-match with the original Dominion set (indeed I first played it with one of these, and was severely confused when I got base Dominion and it didn't have any of those cards, but obviously played the same way!).