Another playbook: to mention it in context of their pre-qualifier "baseless conspiracy theory", as if this is a fact set in stone, without the need to examine any evidence whatsoever and allow viewers to come to their own decisions in this regard.

The implicit message from them is "Of course it's rubbish, because we just said so..."

It's a good one though... was nice to see it again. I wonder what happened to his career from that day on...

I've never understood why people feel compelled to downvote people who post facts.

Pointing this out doesn't detract from a message but it does put it into relevant context. Things have different significance based on when they happen, not more significance nor less necessarily, but different.

Yes, you're right; it's a video clip from one of the episodes of a British late-night television talk show:

https://en.wikipedia.org/wiki/The_Last_Leg

https://www.youtube.com/c/OfficialTheLastLeg/about

which was, and still is, presented/anchored by Australian comedian:

https://en.wikipedia.org/wiki/Adam_Hills

https://www.smh.com.au/entertainment/tv-and-radio/adam-hills-explosive-rant-at-british-politicians-on-the-last-leg-20150703-gi4ni3.html

https://www.huffingtonpost.co.uk/2015/07/03/adam-hills-the-last-leg-tv_n_7729342.html

A slightly longer clip of it was uploaded to The Last Leg's official YouTube channel over six years ago in late June 2015 (shortly after Trump's 2016 presidential campaign started):

https://youtu.be/YArJcth7ywc

and it has 411,859 views as of now.

About two weeks after that, someone else also uploaded the shorter version to YouTube in July 2015:

https://youtu.be/vxlThdqoxuo

but it only has 1,250 views as of now.

I wonder why YouTube has not removed the above two videos after all these years...