Your correct in a technical sense (eccept for mabe the fetaverse linkages) but not a semantic one,

Yes its absolutely technically true that people delete their unified account from the "other place to do so called threads account management page"

but semantically its a "new service" that they were "signed up for" with its own app, and if/when they delete their "threads account" everything else goes with it for some odd reason

Facebook and their dumb opaqeness