The "white cis man" stuff isn't an incisive comment, it's an academic's way of trying to get into an insult war with other academics.
Constantly calling out "cis men" is in fact transphobic, which is how you can tell they don't care about it. If you think cis men and trans men behave differently or are always treated differently, this means you don't think they're both men.
Also sama is not white. Although he does appear to have gotten a series of jobs with not a lot of experience by convincing Paul Graham to figuratively adopt him.
I mostly agree with your points but how is he not white? He acts like a textbook white person and I should know because thats also how I and most of the people I associate with act. Everyone of us would say he is white.
> "[...] If someone — correction, if generally a white, cis man — presents himself with enough confidence, then venture capitalists, media [...]"
I stopped reading right there. This kind of race-baiting adds zero context to the story (which may or may not be true).