It's a very literal one.
I think I've been very open about what an accomplishment they've made, and how proud they should be to have kept Chrome users safe for all of these years.
It is exactly because their efforts to secure Chrome are so impressive that I think this event is interesting.
None of what I've said is about Rust or even a suggestion that they shouldn't keep doing what their doing. One ITW exploit in a lifetime of a product is a great track record.
It is merely interesting to observe when herculean efforts fall down.