Your CDC figure is an average over all genders. Assuming hacker news readers are disproportionately men, the mortality rate is even higher, since men die younger than women on average.
If anything the average software engineer is more likely to die of heart disease due to our sedentary lifestyles.
Sitting on chairs is the real "risky behavior" in terms of health, although few people think of it that way.
My intution is there is a distinction besides the fact both are sedate behaviors
But in modern times it's persisting much longer such that in our twenties there are still about 6% more males than females. Consequently, and in terms of actual coupling, this now means that even if every single female was actively seeking a partner, about 6% of men would end up alone. Homosexuality and other features may change the ratios somewhat, but it's probably again a fairly reasonable ballpark.