You are overthinking this.
A company with proper, actual technology will explain the terms they invent.
This is just some con artist putting random numbers and letters together. Like 10000W PMPO boomboxes in 1990's. They come with some gibberish and then they copy each other. Next thing is, someone upgrades their competition to 750W HD camera.
Regarding your question about 1000x1000 pixel color camera, in the typical/normal/default case, this only means 1000x1000 monochrome pixels coated with a so called Bayer filter in which 50% of the pixels sense green, and 25% and 25% sense red and blue. The gaps in color channels are interpolated in camera software (firmware, or when shooting "raw" files, this can be done later). These interpolation algoritms are nowadays much better than just linearly filling in the gaps. After all, you have actual image information at each pixel site, just in "wrong color", but an advanced algorithm can get quite close to the ideal/imaginary case where the same site would capture all three colors, by utilizing the fact that real world often consists of dull colors with lot of correlation between color channels.
This is the widely accepted way of specifying number of pixels, you just need to know this, you are not getting 3x1000x1000 actual pixels, but quite close to it in general purpose imaging. But if you are shooting a scene in deep red lighting which only registers in red pixels, you are going to notice significant reduction in resolution because the camera has only 25% of pixels to work with.
In earlier broadcast video cameras (don't know the situation as it is today), it was common to optically split the image to three separate monochrome CCDs. When they got the registration exactly right, these systems really did have each pixel site registering all three color. I bet this is quite rare today as CCDs (or CMOS sensors, more often now!) can be just manufactured to have ridiculously high number of pixels, like 20 million. The resolution is huge even if you need to interpolate colors. It would be nearly impossible to split beams and register three separate CCDs to that accuracy.