Wow, the data this guy uses is, at best, out of date and at worst, flat out wrong.
Just because there were no diagnoses before 1943 doesn't mean autism didn't exist. Slapping a label on something doesn't magically make it appear. For all we know, changeling stories could easily have been a way to explain behaviours we might call autistic today among a number of other phenomenon.
Wakefield's study has been debunked many times and there have been multiple studies disproving the idea of a link between MMR and autism, not just one Danish study.
And why the hell should I listen to someone who promotes shit by TACA (Talk About Curing Autism), an organisation for curebies, by curebies?
And the idea that boys get it more than girls is questionable. Autism presents differently in girls due to girls being better as masking than boys, therefore being more likely to pass for neurotypical and therefore missing out on early diagnosis. (That being said, I've always been a poor masker and I still didn't get a diagnosis until Uni.)
If you want to know why diagnoses have spiked it's not just tots getting diagnosed; it's teens, adults and even elderly people are only just learning they're on the spectrum.