I think it's a play on recent "this X does not exist" trend. https://www.thispersondoesnotexist.com/ https://www.thispersondoesnotexist.com/ https://www.thisw

I think it's a play on recent "this X does not exist" trend. https://www.thispersondoesnotexist.com/ https://www.thispersondoesnotexist.com/ https://www.thisworddoesnotexist.com/ https://www.thisworddoesnotexist.com/ Maybe "never existed" alludes to the time dimension used to generate these fictitious rivers; they don't exist now and they didn't exist in the past.