It's a pile of s**t with a grain of truth.
The grain of truth: autism is inherited, and a lot of the mutations are X-linked recessive traits. An autistic parent is more likely to be distant, withdrawn, and hands-off, especially if they're struggling with depression and anxiety and sensory overload and piss-poor self-esteem. Which, if you're undiagnosed, you likely are.
Also, kids-- any kids-- will do better with a parent who's teaching them and working with them and actively involved in the process. Usually, mom is that parent. Not always, but usually. If mom's checked out, for whatever reason, the kid is going to suffer.
Also, until you learn how to parent them, autistic kinds kinda tend to push everyone away. Especially doting mothers. I pushed my doting grandmother away, and she'd already had an autistic hubby and stepdaughter to learn from and thus pretty much knew what she was doing. So sometimes non-autistic parents learn to be a little chilly with autistic kids-- and a little chill might actually be a GOOD thing.
But that's it. If being emotionally distant and kinda hands-off caused autism, every one of my kids and most of my cousins would be autistic (and I sure as hell wouldn't be). So basically it's BS, with just enough truth in it to make it pernicious.
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"