That's exactly what it is: just new content, or rather, a parade of hypocritical lies disguised as a discussion.

Let me explain.

It usually goes something like this:

Remix creates content in the first review, gets views, donations, and other YouTube "perks." Then, due to a conflict with the author and under the guise of discussing the first stream, he does a second stream, but this time with the author, getting all the same benefits, but twice over.

Furthermore, in the second stream, he usually displays remarkable reasonableness and stops throwing around harsh words, badmouthing the author left and right, because the author is in the live stream with him. Since the discussion is quite constructive on his part, viewers get the illusion that Remix is actually quite objective in his judgments. This, in turn, whitewashes his reputation in the eyes of viewers and forum participants.

So, in the end, he's in a double win situation in terms of content, donations, and adding to his "objectivity" score. PROFIT!

And what does the project author get? Well, I don't even know; at best, their nickname is mentioned in the video title, but that's it. Because no links for viewers to contact the author are provided. Except for a link to the mod, and even that isn't the author's...

And where are the mutually beneficial conditions here?