Potentially the purpose is that if someone goes to the effort to get those details together, they are more likely to send the same report to other trusted individuals. Maybe it was originally there to add legitimacy, then they got a report sent in, and removed it to slow the spread of awareness
Most people, to find the affected versions, would either have to bisect or delve deep enough to find the offending commit. Either of which would reveal the attacker.
By not asking for the version, there is a good chance you just report "It's acting oddly, plz investigate".
