At 0.58 you seem to have skipped in the tutorial and we see a bunch of additional nodes all of a sudden. I can't make out the names of the additional nodes as the video resolution doesn't allow for clarity to see the names. Can you screenshot the whole nodal setup and upload it to a website and post the link here please.
Awesome tip! This must be very new. I just tested it, but it does not work, it is "black" and it only takes the first color on the Color Ramp (IN fac) in Blender 2.82 & 2.83. 2.80 does not seem to have the feature yet. What am I doing wrong?