They didn’t assert it as if it were significant, they asserted it as if it were
fact. Which, let’s be clear, it is. And no sufficiently informed person
could argue otherwise, given that the historical development of computing was driven, in its entirety, by the needs of, and investments made by, businesses and militaries. The early development of computing
cannot be anything
but intertwined with the nature of its early developers, which form the foundation upon which all further historical (and political) development of computing
must stand. You’re supplying the idea that recognizing this basic, ground truth, and really ludicrously obvious
fact is
also casting those foundations as “inherently bad”.
Also capitalism is not comprised exclusively of capitalists, any more than militarism is composed exclusively of military supporters. Capitalism is a political framework centered on economic power, militarism is a political framework centered on martial power, both of them are ways of understanding the cultural and political and economic and rational systems we all live within, whether we support them or not.
Nothing on the linked page says anything particularly supportive or pejorative about those frameworks, it just acknowledges them as foundational to computing. It arguably makes a very (if not inherently) capitalist argument for environmental-conserving usage of computing resources, but that, really, is about it.
Anything else you’re supplying, from your perspective… my point is that such a perspective is, itself, already polarized.