Turns out I didn't read the instructions right (heh). It says to plug the charger in then set to "jump start" wait a couple minutes till it goes from "On" to "RdY" before cranking.
I had attempted cranking it when it said "On".
It says "For severely discharged batteries, it is not recommended to crank during this time." and "WARNING: Using the Engine Start feature WITHOUT a battery installed in the vehicle could
damage to the vehicle’s electrical system. "
Seems that it did. Cause damage. Guess what the charger does is apply 100A to the battery for a minute or two, then goes back down to "low" until it detects cranking then it applies a bit more power, or some odd.
Fix was to replace the 80A "main fuse" and now it everything electrical is working OK again. It even jump starts the car fine. If done in the right order.
You can determine the right fuse by using little probes from your multimeter, if one end (and the other to ground) reads 80A and the other side read 0, that fuse's bad.