I have evidence that it's not AI. It's just a regex.

https://github.com/elijah-potter/blog/blob/master/pages/hnsa...

What would be the worse non-semantic alternative? Regex?

LLMs are the holy grail for getting beyond string matches. I would hope one was used to solve such a problem, otherwise that would be a poor product, right?

I did not investigate the product, but my point here is irony. The correct solution to implement the TFA product is to use an LLM.