Mac OS High Sierra how to see Username for the failed login attempt
After reaching out to Apple and not getting the answer, I was finally able to find the answer to this. To see the redacted information i.e. one that is marked as '&lt; private >' I needed to turn on private mode. Here is the command to do that:

sudo log config --mode "private_data:on"


Now you can lock your screen and log back in and from now on the logs will show all the information that was earlier redacted and marked ''.

Hope this helps someone else looking for the answer.