As a follow up to this, in a move literally everyone could see coming, the ATF has apparently raided a company named TwinBros LLC that was manufacturing and selling Super Safeties:
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However there is some weirdness going on because that tweet has been edited, apparently the original stated that their other product, the pepperjack, had been ruled a machinegun as well, and frankly from what I've read of it, it sounds like it was much more legally problematic. My personal bet is this is a case of them going CYA mode, because I suspect the real issue was the pepperjack, and the ATF not being ones to let good guilt by association go, likely used it to take down the super safeties at the same time.