Nicks Garage, 572 HEMI, Here we go....

You’re not paying attention.
There is an ignition advance curve programmed into the box.

If you can’t access the curve in the box to see what it is(need a laptop), then the only way you’ll really know what the timing is doing at high rpm is to put a light on it…….. and run it up to the upper limit of the test.
you are correct, I skimmed through the video and heard them say the dizzy was locked. Thanks :)