by Ken Task.
Afraid there is more to change than just that deleted column ... account info has been 'obsecured' as well.
If one runs this query:
select id,auth,username,firstname,lastname,email from mdl_user where deleted = 1;
username column might contain something like:
harvey.wallbanger@somenet.org.1538494747
The .1538494747 at the end is an epoch time stamp as to when the account was 'deleted'.
Although am not following the OP's first statement about 'privacy was run'. So OP is thinking that a factor? If OP knows the date that 'privacy' thing was run, does it match the epoch time stamp of the obscured user account?
https://www.epochconverter.com/
'SoS', Ken