Googled it, and the guy who came up set off so many snakeoil salesman, and technobabble alarm bells, that I could not stomach watching the the whole thing though, even though I usually find that sort of stuff (perpetuum mobile peddlers, lost high tech civilisations, etc) highly entertaining. :7
I don't think Mary Lou's technology, for one, can be miniaturised to the point you don't know something is going on; You'd be wearing a helmet, rather than a pair of glasses -- the emitters and receptors have to go somewhere, and reach all the way around.
The point it becomes dangerous, is where there is context to go with the biometrics, such as the classic, relatively harmless: "Hey look what just lit up; This guy got excited when he looked at that car - send him some ads!", and so on, which is a place where the big data, and machine learning companies indeed already have us by the short hairs, since ages ago, even without the ability to look into your brain.
...and they have a tendency to make themselves indespensible, to the point you can't opt out, without simultaneously shutting yourself out from the things you really want to get to: Many sites and other things use services from the big ones: Patreon, for instance, puts logging in using Facebook above their own independent account system - at least there one have a choice, if being mildly non-conformist, but the two-factor authentication application used by every bank in the country where I live, at one update was made dependent on Google Play services (for the android version of the app). -Don't like it? Tough. :7
All this said, and with my tinfoil beanie firmly in place: I just so happen to be awaiting delivery of a pair of kickstarted headphones with EEG sensing built-in (for sleep tracking).