that is correct it is not variable contrast. it has three grades. L - low, M - medium, H- High contrast. kodak's website states that L and H have been discontinued.

it also states that it is safe under Kodak 13 Filter safelights. (my statement before was based on the red circle with the big red line going through it on the packaging and the word safelight underneath the red-line)

here is the link for tech sheets the tech sheets describe a method using colored filters to control tones, in a manner similar to using color filters to control negative contrast during exposure