I think the Lemmy user you are referring to above got banned, and their posts got removed as the sub-action, but they did not get purge.
Your account got purged on the Piefed instance you linked above.
Now obviously as you can guess it’s difficult to find an example of a purged account on a Lemmy instance as there’s no filter for that kind of actions in the modlog.
There are two different actions
The documentation explains the difference
https://join-lemmy.org/docs/users/04-moderation.html?highlight=purge#how-to-moderate
I think the Lemmy user you are referring to above got banned, and their posts got removed as the sub-action, but they did not get purge.
Your account got purged on the Piefed instance you linked above.
Now obviously as you can guess it’s difficult to find an example of a purged account on a Lemmy instance as there’s no filter for that kind of actions in the modlog.
TIL, I’m not an admin so I never interacted with that functionality (nor did I rtfm, clearly)
already planning on making a sequel yptb post complaining about being purged

The API has a filter for AdminPurgedPerson, but the result doesn’t include any info on the purged user.