What steps can I take, given Microsoft Defender's report?

In September I posted a question in this forum, I'm not sure what to do with the data breaches Microsoft Defender reports. I've proceeded to use the "Take Action" button. After clicking on that button Microsoft Defender took me to its report on what it found. It listed a website I've never heard of before. I use a password manager, so I double checked there. I don't have an account on that website.

The information it has there is about half correct, a quarter of the information is wrong, and the rest is out of date by 10+ years.

There were a few other websites that it reported on. Some I can manage, as Microsoft Defender gave me enough information about them. Others are not helpful, as Defender just says, "From an unknown source", then the rest of the information isn't helpful at all.

Anyway, my concern is that this information is out there especially with the first reported incident, and I don't see how I can stop this spurious website from displaying it. And I certainly have no idea how it got it in the first place. So, what can I do about some website that got this information from somewhere and displays it for whoever to see it?