The usual vegan dietary issues can be solved with a few supplements and a lot less drama.
My wife and I are not vegan, but vegetarian. It sounds like a bad idea to strictly follow a YouTuber without checking in with a nutriologist or doctor when you are full vegan though.
I would still watch her videos though even after this drama. She has some tasty recipes :)
But seriously, the first person to ever eat curdled milk from a pouch made of intestines must have been really fucking weird. There was probably someone eating cow shit in the village square, looking like a complete moron, and it never picked up because, 1) yuck and 2) no nutrition. But the cheese person started a whole thing. Does innovation happen at the fringes, with vastly more failures than successes?
Any sufficiently large group has it's outliers, zealots, and weirdos.
Raw-foodies / fruitarians are the weirdo subset of vegans. Flat-earthers are the weirdo subset of Christians. Sovereign Citizens are the weirdo subset of Libertarians. White Nationalists are the weirdo subset of Conservatives. Parents who speak exclusively to their kids in Klingon are the weirdo subset of Star Trek fandom.
Usually, they then ignore medical advice, especially when it involves taking antibiotics, and try to cure themselves through wishful thinking and more diet. After that predictably fails they are then magically cured of all ills 8 hours after consuming eggs and fish.
They're HAVE got some serious issues and it's not a plant based diet.