Why would he go? Based on the stock price (which is what the board looks at when finding a new CEO), he's doing amazingly. It sucks for employees but unfortunately they have no say in how their CEO is chosen.
He is not doing amazingly based on the stock price. We can't compare Google to General Motors or Procter & Gamble, we have to compare it with Microsoft, Meta, NVIDIA, Apple, Amazon, etc which are companies in businesses adjacent to Google. When looking at its peers, Google is mediocre at best.
The stock doing well doesn't seem to actually suck for employees paid largely with stock grants. At least I suppose many on the outside will be thinking that as they question why the employees are complaining so much.
The share price isn't doing well though. Their peer companies have been growing in value faster on both short and long timescales. Their P/E is also quite low compared not only to other big tech companies, but even large companies in general.
And that's at a time when Google should have been doing a victory lap, as a decade of bleeding edge research into AI pays off.