FWIW, I haven't heard of them (but I'm no expert in the field).

They do seem to be ghosts on the Web. That's odd these days, but doesn't necessarily mean anything. A Web presence is not a legal, or practical, requirement; nor does it indicate competence or lack thereof.

Perhaps you should contact REI and the product manufacturer and ask for more information about the organization and its testing process and approval criteria. These are fair and valid questions.

BTW: I have one of these firesteels, and they produce an impressively hot spark -- quite effective, even with very coarse tinder. But I haven't given it a total hell test, so YMMV.