Except as we have learned "preference rollout" is also "installing extensions". So this is much the same as studies, but studies was disgraced, so now this is studies 2.0, no option to disable this time around.

And if you look at the big normandy JSON, hey, it's all the same Pocket and heartbeat shit we've seen from studies.

That doesn't answer the question: does Normandy get disabled by the UI option or not?

One can guess based on the wiki page that the answer is "no", but that's just a guess.

"Explained" is perhaps too generous a word. I'm a software engineer and I found that page to be confusing. It seems to be written for internal Mozilla employees, not for the general public.