I think it is worth nothing that this publication is two years old, and has already gained a reputation as one which leans towards challenging vaccine safety as a matter of editorial policy. Which is fine, their prerogative of course, but worth stating it is one.
I am sure you would agree that the single biggest factor in autism is genetics. We also need to consider that autism is something we have only defined with any degree of clarity since 1943. Before that, whilst the spectrum of conditions obviously existed, most were misdefined and (indeed) pegged as an extreme form of schizophrenia (which I find very odd). I think what has changed more than anything is that society is more willing to diagnose and accept conditions like autism than it has been in the past.