You ISP also collects and sells data to companies like Moz, and possibly to Google too.

URL paths over https wouldn't be transparent to the ISP though, would they?

They would not - GP was probably bringing up something not directly relevant, but still related. (they should have clarified though)

What can I add? I know the domain could be found. But how did Google index a page that is example.com/$MD5.html - guessing 128bit numbers is hard.

I have visited that page from a signed-in Chrome profile.

	▲	throw10920 an hour ago \| parent [-]
		Erm sorry when I said GP I meant of my comment - that is, phoghed's irrelevant comment about ISPs collecting data. The information you mentioned is relevant. Unfortunately, it could be either Google/Chrome, or the LLM service you're using for development is misusing your data.