I went ahead and tried this fix: "Try sudo apt purge lighttpd and then pihole -r to make sure all configuration files are in the right place." Posted by Dan in the other thread referenced by him in the github thread.
After trying 'sudo apt purge lighttpd' and then 'pihole -r', my new debug token looks like this:
https://tricorder.pi-hole.net/e8vut85orx
I am now able to access the web console via http://IP_ADD/admin, so apparently that worked and my previous post about 'that doesn't apply' was wrong. I'm simply posting this reply to ask.... what was that? Can someone explain why that worked and what was wrong etc? I am technically minded and extremely saavy at windows, but this is my first linux foray and would really like some technical explanations so I know what is going on - if it's not too much trouble and someone has time.