I think it was her that pointed out how Michael Kiske stands while he's singing and how it affects his ability to sing.
Yep. She's done the same with JLB (either LALP or BT4W or maybe both). She really emphasizes how one's overall body position impacts the ability to hit high or otherwise difficult notes. She also emphasizes the singer's mouth position.
One of my favorite of her videos was an analysis of one of her own live performance from X years prior. Her worst habit is occasionally picking an inferior version (live or studio) or using a video where live footage is synced to the studio version and (seemingly) not knowing that's what it is.
she's the only "music reaction channel" I know that can make a 40 minute video out of a 5 minute song.
Yeah...whereas Doug almost never stops the song to analyze something, Elizabeth is at the other end of the spectrum in that regard.