Have not read that article yet..but will check it out soon when I'm free. Rather busy these few days.
Don't worry if you're kind of confused, I'm confused as well. My thinking is that since blue, red and green are primary colors. For a coral to appear intense blue,red or green, it should have reflected off a high amount of primary color, which corresponds to an increased absorbtion of light of other spectrums. So you should be right in interpreting that such corals will indeed become the hottest. Normally if we buy intensely colored sps and place them in an area of low light or low flow by right they should brown out? This phenomenon should be linked to the article mentioned, but in what way I have trouble explaining. I have a mental block at the moment.