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From the video about 45 seconds in:

"but if they existed, they would solve one of the largest mysteries of cosmology"

Is that not enough?

The video made it clear that they are hypothetical, with a lot of, "if they exist"

This video might give you some insight on why they use the research that they use, or rather, the lack of research they use. https://www.youtube.com/watch?v=HjHMoNGqQTI

Okay, what billionaires want propaganda about weird star objects?

This kind of thing is important with relation to some of their video topics, but what's the connection here?

Unless he said they were real in the video I don't see the problem.