It's not a crazy idea where he's coming from:

- Google will develop Android OS behind closed doors starting next week: https://news.ycombinator.com/item?id=43484927

- Google will develop the Android OS in private: https://news.ycombinator.com/item?id=43482798

It's reasonable to think Google is choking AOSP.

There's quite the panic discussion in GrapheneOS matrix chat