Bad post.
A: old news
B: massively misleading headline missing important context
C: Most likely partially fabricated by law enforcement according to many experts and the tor project. They didnt execute a full timing attack because they are not capable of doing that.
From the limited information The Tor Project has, we believe that one user of the long-retired application Ricochet was fully de-anonymized through a guard discovery attack. This was possible, at the time, because the user was using a version of the software that neither had Vanguards-lite, nor the vanguards addon, which were introduced to protect users from this type of attack. This protection exists in Ricochet-Refresh, a maintained fork of the long-retired project Ricochet, since version 3.0.12 released in June of 2022.