Only www.google.com and other subdomains are preloaded unfortunately.. I’m having trouble quickly googling the reason (is that irony?) but from memory a Googler said that they had a lot of internal stuff hosted above google.com they couldn’t make https (HVAC controllers and such?)
You can see the full HSTS list here I believe: https://source.chromium.org/chromium/chromium/src/+/master:n...