This refers to the shut down Samourai Whirlpool.
But the coordinators listed on https://liquisabi.com/ use the WabiSabi protocol used by Wasabi Wallet which does not share the users xpub.

It is not 100% clear if FEDs could access collected XPUBs of Samourai Wallet users, but it was mentioned on the hearings and developers reported about 20% of users that were using Whirpool coordinators.

https://www.therage.co/samourai-wallet-maximum-sentence/

satsbridge

some of its users, probably a majority, could be doxxed at scale.

privacy

Privacy in Bitcoin, state of the practice

> some of its users, probably a majority, could be doxxed at scale.

How?