Lol that article was complete, to use a fitting ancient word, balderdash. The Advanced switch is (supposed) to get our normal releases more quickly. That’s what Elon promised us. It has nothing to do with Early Access or FSD.
Anyone in early access will be notified and has their car added to it by VIN. You get release notes by email.
Or so I’m told. Seriously. I’ve never gotten early access firmware even though I got something last year saying I was in early access.
New company line is that that switch will work even better for those who purchased FSD at full price(actual EAP invites not in the cards anymore). That they’ll be at the front of the line for every new release. Of course, I’m in that group and am still on 16.2, despite my switching on Advanced and various flavors of 16.3 being available in my region to my car spec, so....