"Meritocracy" isn't. It's a sham, a veneer layered on over an ugly and disgusting history of bigotry and oppression, to cover up the underlying biases which still exist and are perpetuated every day.
Assuming that any attempt to change the system necessarily involves hiring/promoting "unqualified" people shows one of those biases: the bias to believe that anyone who does not resemble the existing majority must be "unqualified" or else they'd already have succeeded.
Which is much like the economics joke: an economist and his friend are walking along, and the friend spots a $20 bill on the ground reaches for it. The economist says "that's impossible -- if it really were a $20 bill it would've been picked up by someone else already!"
We know that the old convenient lies -- "people of that race/gender/etc. just aren't as interested in our field" or "evolution shaped their brains to be good at other things, not at this thing" or... well, any of them -- are just that: lies. We know that when a more level playing field is forced upon an industry, suddenly that industry stops looking a lot less white and a lot less male, and further stabs the heart of the "it's a meritocracy" lie.
Promoting the lie of "meritocracy" is, at this point, insupportable and indefensible, no matter who does it or why.