The CMI comparators do a very good job rejecting pre-1944 wheat cents with a pre-1982 brass cent as the reference coin (except don't use a 1972-1978 for a reference)
It works because early date wheat cents were a Cu/Sn alloy (bronze). 1943 were steel.
The video is of the PennyMiner sorter. It uses a CMI comparator.
Rydale uses a CMI comparator.
Franken-Sorter uses a CMI comparator as does a lot of members' home-brew sorters.
The Coinalyzer and other Asian-Made comparators might not perform as well as the CMI devices though. I haven't tried any of them though so I'm guessing.