It seems to be a social justice tech pundit initiation ritual to attack Linus Torvalds' management style and the culture that surrounds the Linux kernel.
It's not a bug, it's a feature. It's not supposed to be welcoming, it is supposed to be a filter, because the wanna-bees far outnumber the bees. Complaining about it is like complaining about the nature of special forces training. It is demanding, unsympathetic, and hostile to failure for a damned good reason - because the cost of failure is high, higher than every other open source project. The claim that that is what keeps women out is self-defeating, because you're not advocating for women, you're calling them weak and incompetent far more plainly the dog whistling of the Internet misogynist.
No one is obliged to change their culture to suit the delicate sensibilities of someone else. You want to fit in with a foreign culture, the onus is on you to change, not the other way around. If you want more women to participate in the Linux kernel, the onus is on you to change how the wider culture indoctrinates women, so that they can learn how to correctly perceive the nuance that exists in that style of hyperbolic insulting criticism, which most men understand even if they don't like it.
Give it a chance and I think you'll find that it's a lot more fun and honest and helpful than the passive aggressive style of criticism that the social justice cult considers "constructive".