GAW,
No, I do not believe it is highly flawed, I believe it is exaggerated to help make the point easier to understand, but not flawed in it purpose.
As far as who is competent? Regardless of your disgusting comment about who is competent, there is no question by any sane individual, that Harcsztark is not competent to change halacha as codified by the Rema. You think his high school rebbe made him so or perhaps the board of the school?
Harcsztark’s whole letter publicized his own incompetence in psak to the whole world.
You will note that the it is the Rabbonim who are always listed as the gedolim of the Modern Orthodox communities, the ones that the centrist commenters bust a gut in their insistence that they should speak in Lakewood, who are the ones leading the protest.
So it does not have to be defined who is a competent authority because the only ones who are publishing/paskening to contrary are so clearly incompetent.