'This tendency to absolutism is something that Zoe Mason also observed. 'Susie is certain she knows what's best for young people and will fight for them even when there are other people who might disagree,'
Well, she would do, wouldn't she?
She's hardly likely to turn around one day and say "oops, perhaps I was wrong, Jackie".
It's natural that she would feel the need to pour all of her energy into convincing the world (and herself) that she was right, because the alternative is too much for one human to cope with.
The problem is that other people and organisations should have said "well, hang on" for the five years her TEDTalk was online, instead of agreeing with her that the emperor has no clothes.