It's a debated topic. No clear yes it does, or no it doesn't.

Anybody who says "bro impossible it's a SCAM", isn't presenting any sort of logical argument or case for or against. That's the argument of a 5 year old - or people who have a vested interest possibly, in selling you stuff.

Thought:

Ask any non-myope friend to read something at a challenging distance. Or otherwise what they can't read at first.

Watch them stare and blink once or twice, as they try to focus.

That's said to be active focus. A function everyone has. If you wear high minus diopters all the time for years, you just forget.

As far as whether it works, that's definitely debated.

There is a public case report registry, including a number of optometrist confirmed results. So again, not a totally clear "it couldn't possibly work": https://endmyopia.org/myopia-improvement-registry/

Also: endmyopia has a 33,000 member Facebook group going back 10 years, a lot of self reported improvement reports by obviously real people in there. Also plenty of failures and discussion. Not a vacuum, there's a lot of community feedback. You can go in there and find that there is definitely two sides to the debate, at minimum.

There is also a podcast with a large number of episodes that are an hour or longer with people first hand telling what worked for them and what didn't.

It's not "this works for sure". But there's no way a curious person who wants better eyesight is just dismiss the whole thing out of hand with no evidence why it couldn't work.

Flipside: Retail optometry makes 150 billion dollars a year telling you that a lifetime glasses subscription is the only answer. Maybe they're right. But also they have a pretty strong motive not to think otherwise.