They did? I just checked the KS page and see no mention of what you are saying? The KS was for three HMD products with expected launches. Although you might be correct that they get the base unit done first (which makes sense) but there are areas of the 8K-X that have nothing to do with the 8K and it would be nice to know that somebody is working on those unique design goals in parallel wouldn't it?
Could be a major bummer if they turn around and say that 2 x DP VR is impossible this late in the campaign for instance. Or that dual bridge chips for VR do not exist so the 8K-X is just a theory.
Anyway, it is all speculation until somebody official responds
Edit: The KS page says:
"- Only for those who own a PC with at least GTX1080ti (still testing, may need 1080Ti SLI, or the next generation graphic card e.g. Nvidia Volta), CPU i7, and 16GB memory."
...and the keyword here is "still testing" so they are doing something with the 8K-X, just not reporting on it.