a similar but different example of strange use of 'Partcipant XXX' is the notify email on release of grades / feedback files but this time in the body of the message
PFS01 ->Assignment ->Test essay
Participant 324 has posted some feedback on your assignment submission for 'Test essay'
You can see it appended to your assignment submission.
Question: why use the wording 'Participant 324 has posted'... they didn't and it makes no sense that I posted to myself !
Again, the email sender and body text should refer to the moodle as the sender of messages when blind marking is in use.