Having been through this myself -- but as an individual-contributor rather than some kind of Thought Leader... and seen others go through it.. Sounds about typical for Google acquires.
Google will tie fairly lengthy golden handcuffs onto their acquired employees precisely because of what you see here. As soon as they run out, most -- especially the founders and senior folks -- leave.
I stuck around (for another 6 years) after my 3-4 years of golden handcuffs expired because there was nothing else that paid as well in my area. But most of my NYC colleagues from the same acquisition bailed as soon as they got something else compelling.
Going from a fast moving startup where you get to make decisions on your own rather small codebase, to a giant beast like Google is... hard. Much of what was in this article is saying is familiar. But when we joined Google it was "only" around 25k engineers. Now it's wayyyy more than that.
In our case they basically seemed to buy us out to eliminate us (or so the DOJ is saying now https://crsreports.congress.gov/product/pdf/LSB/LSB10956 ... though they didn't at the time). For the first year they kind of just let us flap in the wind without integrating us, while they just rewrote features from our stuff into their stack... mostly without us.
2 years in I felt a bit like the "Rest and Vest" scene from Silicon Valley. Though I got myself out of that trough for a while.
It was a weird feeling of simultaneously being happy for the opportunity and the Really Good Money, but also a tinge of bitterness about the circumstances of the whole thing.