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I think this paragraph from the Nintendo Life piece makes the same point as you:
It’s worth remembering that, for reasons only known in Nintendo’s HQ, the Wii Virtual Console version of Super Mario Bros. was believed to be derived, either entirely or in part, from a ROM online. The video below from Eurogamer sums it up nicely.
Except that the site has to be careful to not say things that it cannot back up, for fear of legal action.