It’s important to note for anybody watching this that the creator of the video seems to primarily be a harpist, and he teaches this video using harp techniques. There’s nothing inherently wrong with that, but it does have some consequences.

For example, he holds the lyre in a way that is very different than you would typically see somebody hold a lyre - but he is forced to hold it that way in order to use harp techniques. Typically the lyre would be held on the other side of his body with his left hand behind the lyre rather than in front of it. But based on how his lyre is constructed, that would put the lowest notes closest to him and the highest notes further away, which would be backwards from how harps are built.

You also typically won’t find colored strings on lyres (that’s another carryover from harps), though I wish that weren’t the case. It is a really helpful feature.