A user created a thread in this lemmy community remarking that the Tor Browser has a personally identifiable fingerprint under normal settings (the “Standard” and “Safer” modes make you fingerprintable), with several commenters doing the same test and reporting the same. The user who created this post also said that on the privacy guides forum posts about this topic are being deleted.
The poster could try to provide proof. Has at least one of these posts been archived (on archive.is or archive.org)?
Tor and Mullvad to a lesser extent don’t try to erase all fingerprints. They try to normalize the ones that can’t be hidden. So your fingerprints will be randomized within a pool of choices and everyone using Tor or Mullvad shares the same pool. So instead of trying to disappear, you try to blend into the crowd. They can see you, they just can’t tell you apart from the person next to you because your browsers are all broadcasting the same information.