Rust was not the cause of the bug. It was a C bug and was exposed during the process of deleting the code in question (adding the new code to replace it actually exposed the old bug).

It has given us a very keen awareness of just how bad such bugs can be, and hence "we had a bug once" might be considered the soft way of saying "no more effing C". Of course we'll still have C and C++ as we're heavily invested, but if there are safer alternatives that we can use those will definitely be considered first.