GP's argument is not for diversity (of race/gender/class/whatever else), but against the idea that such a project would necessarily be utopian, or that only individual action can fix a systemic issue. It doesn't even argue that there is a systemic issue, it is only a comment on the nature of systemic and individual issues.

GP's comment, far from hand-waving away 'anything they don't like' actually seems to be an argument against hand-waving based on a narrow, constricted view of societal problems (i.e. on the level of individuals and particular firms). The theoretical model propounded in the top-level comment should be questioned. If we still end up at the same answer even after questioning, that's fine - but it still needs questioning.

I don't think anyone actually argues that SV hiring practises are 'evil' or deliberately a particular way. GP seems to agree - evil is very much an element of conspiracy or deliberate action. We need to look wider than that, and not assign blame to people working within a system. When one says "that's just the way it is" - the correct answer is not "because of evil people", but rather to answer with a question in return - "why is that the way it is?". That way, you can start investigating the system rather than the individuals within it, who work to their own ends (as libertarian economists are fond of pointing out).

The constant dichotomy in these discussions set up between 'equality of outcome' and 'equality of opportunity' can only perceive individuals and individual firms. That dichotomy is worth questioning if we want to even consider the systemic view. The systemic view, as every philosopher I can name (on the right or the left) propounds, considers equality of opportunity. Marx himself famously rallied against these abstract notions of 'equality'.

There is only one philosopher in the whole of Western political and philosophical thought who propounds some kind of exactly equal distribution: Barbeuf, and he lived in the 18th century, and his ideas are not currently popular.