This doesn't seem to work at all, at least for me.

First, the test claimed that my connection suffers from isp header injection but didn't actually indicate which headers my isp might be injecting, or even what the consequence of thus is.

Second, it claimed I am using my isp DNS, which is not correct.

I've flagged this because this is vibe-coded nonsense that hasn't been tested. It is hosted on Vercel, and Vercel forwards the public IP to the app, which then decides it is a MITM.