Obviously the words "guessing" and "implies" means it's conjecture, but it's a possibility, a likely one. There's no new technology here just a potted MC and apparently a very good one. Then again, perhaps it has some magical qualities, being able to discern the good from the bad and sort it out for you. Maybe it has no flaws and makes sense of things other carts can't, but is that likely?
Find a master tape dub of the recordings in question and you'll find out.