This has bugged me for a while, but I've never been able to use these in the Material Manager to alter texture maps or HDRIs. Are they supposed to do anything, because on the Mac version of the C4D/Octane plugin they've never done anything.
It's annoying because in certain situations (displacement for example) it means you have to manually invert the image elsewhere, rather than flipping the black and white points.
I'm running OctaneX PR11 on a 2019 Mac Pro under Big Sur 11.5.2, but as far as I can remember, these functions have never worked in any version I've used.