It makes perfect sense as "makes it 95% less likely to hit this bug." Notice from the write up that they already also modified their code to be resilient again

It makes perfect sense as "makes it 95% less likely to hit this bug." Notice from the write up that they already also modified their code to be resilient against the bug being hit at all, so "reducing the number of times the resilience code needs to be invoked by 95%" on top of that is a net win.