I think I found the 15 second spot (at 27:50, for those playing along at home) in that 35 minute video where you actually show the connector on the board. It looks like it’s really just a terminal strip made for solid-core ribbon cables, using a clamp mechanism similar to what’s used on flat-flex connectors. (You did press the clamp down, right? You didn’t show in the video.)
FYI, that is by definition not an IDC cable, because IDC stands for “insulation displacement connector”, and that’s exactly not the case here, in that a) the insulation is stripped, not displaced, and b) there’s no connector attached to the ribbon at all. (Just because something is ribbon cable doesn’t make it IDC.)