As I have mentioned elsewhere, during my tenure Mudge's engagement in this area was a) minimal, and b) not constructive/helpful.
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There is, frustratingly, no footnote or reference in @dotMudge's report to explain why he is making this particular claim.
Most of his other anecdotes or assertions have a footnote with more context and/or detail. It is weird that this one doesn't.
Also, the disjunction of "kernels" or "operating systems" and the use of a single aggregate percentage is pretty hand-wavy.
Given the different mechanics & constraints of OS vs. kernel upgrades at Twitter, there should be two different numbers here.
And since Twitter's OS upgrades and patches were mostly automated, OS non-compliance %s are usually extremely low.
Even going out on a limb to assume that he means only kernel version/patch compliance, the 50% number seems improbably high.