Not sure where you get this from, I'm not in an Android team, but from what I can see the top offered workstation one can get at Google has 64 GB of RAM.
I would assume that there was a special policy in place for people working on teams with a requirement for that amount of RAM.
I interned on Chrome in 2013, and at the time all Chrome engineers got a computer with an SSD (which I was told wasn't standard at the time), since they had to build Chrome on their desktops (whereas most other engineers could use Google's distributed build system).
64 seems a bit low, that's what I need for my hobbyist work. Granted, it doesn't take 64GiB of directly-allocated RAM to link Chrome (anymore), but there's almost no amount of page cache that would not be worthwhile if you have the whole AOSP on a box.
I interned on Chrome in 2013, and at the time all Chrome engineers got a computer with an SSD (which I was told wasn't standard at the time), since they had to build Chrome on their desktops (whereas most other engineers could use Google's distributed build system).