Consider watching the video with FreeTube, a nifty open-source program that lets you watch YouTube videos without Google spying on your viewing habits!
Combined with Libredirect, which automatically opens youtube links in Freetube, it becomes really slick and effortless to use.
Maybe I misinterpreted what Feral was getting at, but at least from my reading of it, he’s saying the myth was ‘half-true’ in the sense that that propaganda was effectively sold to the lowly enlisted/conscripted men to give them self-justification to fight. Whereas the truth was indeed that the whole thing was just for slavery. The myth then became even more useful after defeat to help them accept it ‘honorably’. His conclusion about what people believe and feel ultimately having a larger impact than the actual truth seems to confirm that reading, but I could be wrong.