For a moment there on the second video I thought "holey moley Doug really does have a time machine and went back to the 60's!"
It definitely is an RCA chassis design. It looks like it uses a small VHF knob with a thin lighted window above it for display of tuned channel, and it looks like they may have fitted the place for the UHF tuner with one of those "UHF ready" badges to cover the hole for the unpopulated knob shaft.