Skimming those links, I think the position is that people are already being judged on their identities before they're judged on the merit of their contributions, not that they should be.
The extent and congruence of the findings regarding, e.g., blinded vs non-blinded resumes alone should put the lie to the idea that a true "meritocracy" is something humans can actually meaningfully do at this point.
That's a contrived "no true Scotsman" right there. Also quite a few people argued that democracy should be replaced by dictatorship on similar grounds: "look at America, it's clear that democracy is shit".
Imperfect realization doesn't mean the ideal is invalid (except when that imperfection is inherent to the ideal). You can argue for more equal, more meritocratic community; tearing it down because it's not already perfect is disingenuous and destructive.
The extent and congruence of the findings regarding, e.g., blinded vs non-blinded resumes alone should put the lie to the idea that a true "meritocracy" is something humans can actually meaningfully do at this point.