"According to a paper by the Foveon guys, the sensor does not suffer from "color noise" (actually color aliasing)."
This is not correct.
I was referring to the content under "Color Aliasing" in this paper:
It says this, and more:
"In cameras that employ color filter array (cfa) mosaics aliasing
occurs in the three color planes at different locations. This artifact,
referred to as color aliasing, appears as brightly colored fringes in
locations of image detail at a particular spatial frequency."
Can't see anything incorrect there . . .