After all, I personally already feel the chilling effect of the stated "no complaints" policy, as I mentioned originally, in that I now would not even post what I would have thought to be obviously helpful/constructive criticism such as a broken URL, since that could be construed as a complaint.
That gets back to my original request: If this is to be a post-only thread, with no commentary allowed, then just make it that. There would be no ambiguity and no pretending there might be room for discussion.
[1] That is, in the context of an otherwise civil, well thought-out comment that would otherwise be welcome elsewhere on the forum. I'm not advocating permitting the equivalent of corporate ad-hominem attacks here, and I'd even go so far as to say that discussions that are merely about a particular company (e.g. the ethics of working somewhere with a recent high-profile scandal) and not about the hiring process or working environment itself could be reasonably deemed off-topic.