They never root caused the bug! They know a symptom (Grammarly and this gif cause things to crash) but still no root cause. I was pretty disappointed at the end.
I'm in engineering management at Google. In my org, we're actively trying to improve how we give performance reviews, motivate people, measure the projects people work on, and relevant to this topic, manage out low performers.
The days when people can coast forever at Google are coming to an end. I had to let one person go because they basically never did more than the bare minimum (and got 3 Needs Improvement ratings in a row), and I know many more (some under me, some not) who are approaching a PIP.