(Actually, these assignments are spectacularly wrong, since they give a zero probability to all other colors/numbers. Nothing deserves a zero probability. But let’s assume you gave a negligible but nonzero probability to everything else, and 1⁄12 is just shorthand for “slightly less than 1⁄12, but not enough to bother specifying”.)
The justification given in the original post was spectacularly wrong. The assignments themselves may not be. One could just as easily be using the shorthand for “slightly more than 1⁄12 because I now know that red is a color Omega considers ‘color-worthy’, he can see that I’ve got red receptive cones in my eyes and this influences my probability a little more than the possibility that he has obscure color beads. And screw it. Lilac is freaking purple anyway. And he asked for my probability, not that of some pedantic ponce!”
The justification given in the original post was spectacularly wrong. The assignments themselves may not be. One could just as easily be using the shorthand for “slightly more than 1⁄12 because I now know that red is a color Omega considers ‘color-worthy’, he can see that I’ve got red receptive cones in my eyes and this influences my probability a little more than the possibility that he has obscure color beads. And screw it. Lilac is freaking purple anyway. And he asked for my probability, not that of some pedantic ponce!”