Was Bitcoin's anonymity really at stake?

(I speak Spanish, the information I am using was obtained in a video in Spanish which I will leave you in this post, and my English could be very bad lol)

​

Recently I was investigating how they found several people responsible for black markets (lol) like alphabay or silk road, the thing is that watching a specific video (it lasts 30 minutes and explains the whole story with sources from the book Tracers in The Dark, by Andy Greenberg) explains in a specific part that the IP (protected by the Tor network) that hosted alphabay was discovered by a company called chainalysis, and with that information later organizations like the FBI crashed a car towards his house and arrested him lol, the thing is that according to the writer of the book (who is the main source of the video) chainalysis was not very clear in the way they found the IP address of alpha02 (the man who created alphabay) and the writer of the book theorizes that they supposedly managed to invent a technique capable of leaking the IP addresses of bitcoin users, and that the company had created its own collection of secret bitcoin nodes that were secretly designed to silently record the IP addresses that users transmitted with each transaction, and that created a global map with the physical location of bitcoin users (still connected to the tor network), however when the toxicity of the fact was discovered on bitcointalk, where they condemned it for "mass surveillance" and closed the experiment.

​

This is soooo wtf the person in the video doesn't think this is really possible and I also think it's very impossible, but what do you think?

The video (Spanish, 30 minutes, what I talk about is in minute 25)