@fungipie
There's this thing people do in a debate/discussion where they tell you to go off and read a whole book that explains their point, or read a bunch of reports, or "google it", or "educate yourself", or in this case watch a two hour debate that explains your points. But here's the thing the person telling someone to look to other sources is never able to explain the key points of the books/report/etc.. themselves. To them it all sounds great but they are never able to express those points to another person.
When you're in a debate with someone it's your job to put forwards the points that make your case. Telling them to go off a read a bunch of stuff that agrees with your point doesn't work, because why should they invest all that time and effort? If it's too much trouble for you to draw out the main points and present them, why should they put in much more effort? If you're debating someone and want to change their mind, or prove a point you have to actually do that, you can't put the onus on the other party to do the work for you.
It also always makes me think the other person doesn't really understand their own argument if they can't present the main points. This further demotivates me from putting in all the extra effort if the other person probably doesn't even understand the source they are throwing at me.
If you precised the video you linked by saying, and I'm utterly making this up just as an example, Dr X explains how population Y has geographically migrated through history, and then goes on to explain how their migration affected indigeous peoples of P, Q, and R over time. Then examines the conflicts between them and the fallout of those conflicts on Y and the P, Q, and R which demonstrates ( your point here ).
At least the other person has an idea of what relevance/point you are trying to make. "Watch this two hour video it explains all my points" is just pointless. No one ever sits there for two hours watching a random video if a person can't give reasons for their argument that are backed up in the video. e.g. "at 47 minutes in Dr X discusses the meeting between populations Y and Q, which are the people we are arguing about" Can you see how that works?
Flinging sources at people that require investment to understand does not work unless you can at least precise the arguments presented in the source, thus giving that source context within whatever it is you are debating.
Otherwise it just looks stupid.