Yes, they do. The default machine you get is a pixelbook, that’s true of basically everyone at Google. You can request a Mac, which is what I did, but I later also got a pixelbook and found that I quite like it.
Literally the only thing keeping me from using it as my primary work machine is that it only supports one chrome browser profile per login, so I can’t be logged into my work account at an OS level and my work and personal accounts at the chrome level. But I went and paid out of pocket for a pixelbook for home because I thought it was a great all around home laptop.
(Disclaimer: I work at google, but not on chromeos or hardware, this is just my personal experience )