If you want to disprove their research then set up an experiment we can measure and repeat consistently as they have.
glennf is one that has already done your experiment, repeating it consistently, & far more in depth time wise than the research you've provided. So, if you are suggesting that a PN ratio of 50:1 (e.g NO3 @ 2ppm & PO4 @ 0.04ppm) is detrimental in a reef aquarium, then glenn's experiment has disproven your theory.
cheers