Dismissing out of hand as "ludicrous" that user research on small groups can and very often does produce useful results is enough to discredit the rest of this guy's rant. He wants to be a part of the design process but doesn't understand even the most basic practices of user research.
I am not a programmer and I do not demand representation in coding decisions and I do not criticize code choices I can't possibly understand. I wish that people who are not UX and UR practitioners would afford designers some of that same respect.