As your article states, it's TWO DIFFERENT CHANNELS talking together. Each contributing to the feed, using their own equipment. They're not pretending about anything.

This is not new. DDR in Double mode is quite common.

I hate crap like this. It's exceedingly obvious, but it gets around because it exists as clickbait. Just like Facebook pics that say shit along the lines of "I bet you can't name a band with the letter A in it". They insult your intelligence, and just get spread. I see this crap like a virus, or infection.