I have not heard of using oxytocin for children on the specturm. Are there articles, resources, or papers that talk about this?

I'm on my phone, so it's hard to search and link to articles. Here's the result of a quick search:

https://www.spectrumnews.org/news/oxytocin-spray-boosts-soci...

Hopefully that serves as a jumping off point.

What does it even mean to “reverse autism”?

Most famous example: https://well.blogs.nytimes.com/2016/03/18/an-experimental-au...

It allows people to read faces and emotional context in a way they couldn't before. Some people find that their decision-making becomes less logical and more emotional. For others, nothing changes.

If you search "tms autism" there are other firsthand accounts that you might find interesting.

Have there been any scientific experiments already to validate this method?

As of 2 years ago, there were more than a dozen clinical trials. Evidence is preliminary -- populations are small, and measuring how autistic someone is is not easy.

https://www.autismspeaks.org/blog/2016/03/25/transcranial-ma...

it is like moonwalk but more autistic /s