Earlier quoted context omitted.
Philosophy as a field may be “open and fluid” to an extent, but analytical philosophy isn’t at all. As the author writes, there are basic, well-established methods for sniffing out fallacious ideas. All ideas—even those originating from the philosophy department itself—ought to be subjected to basic analytical philosophy before being let out the door. I think that’s what this piece boils down to.
Yes, if we were absolutely convinced of the correctness of analytical philosophy and the impossibility of good hypotheses arising from other approaches that would indeed be a good filter. If we are not quite so certain perhaps we should not prematurely put the kibosh on ideas just because they run afoul of one particular point of view, but rather let them all into the arena to fight it out?
If so, what you’re really saying is that analytical philosophy is in question... in that case, I don’t think it’s worth arguing with you.