I think the first consensus stated in the article may be the most important point. If you want colored coral make sure you buy colored corals. With the exception that some colorful colonies that we see may be "wild" or even maricultured pieces that have not lived in a tank long enough to prove the colors to be true. There is a lot to be said about both 1) tank raised corals and 2) vendors that keep colonies intact for many months validating the survivability of both the coral and its colors.
I am not suggesting that all the other factors mentioned like lighting , flow, stability, etc are not vitally important. It's just that some very bright, colorful coral do so well under a variety of conditions in many reefers tanks eg., red planet, strawberry shortcake, Joe the coral, pink Floyd, on and on. Tried and true, it's hard not to have them do well.
Maybe if I tried potassium and iron, who knows what I might find