all instance admins have the ability to do this on their own instance, the functionality was added to deal with doxx info being posted so it wouldnt be visible even in the modlog, and it was used a lot to deal with the CSAM spam attack too - basically whenever this happens the relevant message will still be in the modlog but it will be changed to "Permanently Removed". Currently there's no evidence or even accusation that this functionality has been used for anything except the stated purposes though so i wouldnt worry too much.