What they are saying is that tech moguls have a period in their life where they felt they were at their best, living their glory days. They are latching on to and trying to recreate that environment, including superficial properties that environment had that don't actually have anything to do with why it was such a formative period for them.
One attribute of programming back in the 90s is... it was mostly non-poor white guys.
Now, obviously anyone with a certain level of maturity and wisdom would realize that the demographic monoculture of the 90s was an effect of the fact that computers were still relatively rare and expensive in the 80s, and those most people who had access to them back them came from a certain level of privilege. Being wealthy, white, and male all increased the odds that you were able to spend your endless summers PEEKing and POKing on an Apple IIe while other less fortunate people didn't have a computer or had to work.
Being wealthy, white, and male didn't cause people to be better hackers. Having economic stability is what gave people the freedom to become better hackers. It's just that that level of economic stability has historically not at all been uniformly distributed across people in the US. Thus anti-DEI measures are counterproductive. Going forward, society has a moral and rational incentive to extend that opportunity to as many people as possible, regardless of their anatomy or skin color because that's how society gets the most out of all of its members.