And if I were to hazard a guess I think you dramatically overestimate the role of neural networks in search in general.
This happens often when creating complex search terms with 'inurl' and 'intext' operators. This happens to me at least once a month.
I suppose it sometimes looks like my account is used for botting, but then again: why wouldn't I be allowed to connect my bot to their results, given that google uses bots to index the content in the first place?
Despite the fact that I could probably adjust to better fit their 'nothing weird going on here' preconceptions, I think I'd rather complain and hope that over time it's google that will change.
If neighbouring IP's to yours abuse Google services, you'll see way more of these errors.
Then consider yourself lucky. The post was a little rambling, but it wasn't wrong.
Unfortunately, it is no longer possible to use Google Search for searching in Internet. You are only allowed to look up viral memes and query neural networks, trained by other people's searches. Searching for rare and unique things will quickly get you banned. An interesting side-effect: using modern Google to check if name is vacant is meaningless. I used to google for names to see, if something else used them, but Google's search repeatedly returned me 0 results, even when there were multiple pages with that particular name in title, many of them years old. Searching for the same thing couple of weeks later have suddenly returned hundreds of hits.
I wonder, how much it costs to actually query Google's database instead of some distant neural network approximation. Apparently, Google's own employees can't afford it anymore — some of them are using DuckDuckGo instead (they even added it to Chrome, lol)