Why not? That was done on the 2600...
https://en.wikipedia.org/wiki/GameLine
Of course, that wasn't even the first attempt at online downloads...
https://en.wikipedia.org/wiki/PlayCable
So in theory, it could've been done. The thing about technology is that the only limitation is what they're willing to try and achieve. I guarantee the idea was pitched several times, however the tech was either not at the point it needed to be, or it was too expensive to widely release it. Though things like the XBand, Satellaview, Sega Channel, and countless other products showed that the idea of online play and distribution was on the minds of many in the industry for a LONG time.
I didn't say you were, I was saying that people were so focused on the label being fake that they didn't consider the rest of the package. I was responding more to the seller's reply than yours.