I don't think non-Jewish whites are discriminated against in hiring, but if promotion into management is a problem, then yes, management should reflect the population too.

I'd point out that it would appear there is less of a problem with discrimination against non-Jewish white men than against black females (for example), though.

I think prioritising is reasonable.

(I'd also note that in all those cases except Sheryl Sandberg they were founders, so hiring discrimination was a non-factor. I realise this wasn't your point though).