The video didn't give a lot of detail besides 100 fps, just B/W footage.
But if I read the linked spec sheet correctly, there is a monochrom and RGB-filter version available and it does 2000 x 1128 pixels.
19µm pixels are large, and 2000 of them horizontally make for 38mm length, so that would not fit for individual pixels, because you would be monochrome. Probably the 19x19µm "pixels" are processed colour pixels and really are 4 RGGB-subpixels and the sensor does 2K colour and then, withour filter, it would do monochrome at 4K or 2K at even higher ISO.
The old sensor did produce Full-HD colour at 4.5 Million ISO and was also quoted as 19x19µm pixels.
Canon named "nighttime wildlife productions", "deep underwater imaging that require no lighting", "astronomical shooting" and "many forms of surveillance" as uses. The (old) sensor is built into the ME20F