If you can use ADB, the device isn’t bricked. This way to reach EDL mode is probably there for testing purposes, but that’s just my guess.
Apparently it’s at least good for checking whether the procedure and/or EDL mode even work on a non-bricked device.
If you can use fastboot, the device is most probably not bricked. At least there are things possible in fastboot mode which should salvage most of the possible issues.
About the test points, does this perhaps help? I have no real clue either …