[T]he research actually deals with the diversity of cvd treatment across a variety of administrations and does NOT even make a judgement regarding safety issues and cvd.
Actually, the research does make a judgment, in the form of the premise asserted at the start of the paper:
INTRODUCTION: Color is an important characteristic of the aviation environment. Pilots must rapidly and accurately differentiate and identify colors. …
The premise is false.
This point is critically important:
The premise is false.
The attack must be on that premise (and the intellectual dishonesty apparent in the failure to test the validity of the basic premise). If you focus your energy on the efficacy of the different tests to confirm the existence and severity of colour deficiencies, you are falling into the trap of implicitly affirming the validity of the basic premise.
It's no different from a paper that says:
INTRODUCTION: Gravity is an important characteristic of the aviation environment. Pilots must rapidly and accurately sense the exact level of 'g' forces on their aircraft ...