VisualEditor doesn't use Guided Tours

What?

That phrase seems to be from MediaWiki:Guidedtour-tour-gettingstartedtasktoolbar-edit-section-title/en, which is part of Guided Tours (which I thought was unused these days)

Maybe they aren't unused these days. Per my understanding this is a problem in some enwiki local GuidedTour JavaScript definition, to which the text "Or edit a section" belongs. It seems like the GuidedTour is not properly ended or a cookie is not deleted after user leaves the page with this text or some similar cause. On cswiki I was looking for a solution to the same problem in local GuidedTour scripts, but I do not remember the actual solution I've found out and used finally (you can look into the code). I also could not find the JavaScript script, which causes this on enwiki or in core.

Maybe this diff could help. But first you should find the GuidedTour JavaScript, which causes this naturally.

"Turning off VisualEditor's built-in wikitext mode makes inexplicable GuidedTour message go away" isn't entirely accurate to my problem - it went away by itself after I confirmed I'd read the box a few times. I didn't turn off NWE.

Thanks for clarifying, Sam. I've tried to correct this. There's an "Edit task" link in the upper right, and you can edit the description however you want. (I recommend against setting any priority, as that may keep some devs from noticing the existence of a new task.)