I\'m writing a system app for a device that has
no Google Play Services nor Google Play Store installed.
I want to implement push notifications.
The de
Just prior to the quote you posted (about Google account not being required), you have this :
It requires devices running Android 2.2 or higher that also have the Google Play Store application installed, or or an emulator running Android 2.2 with Google APIs. However, you are not limited to deploying your Android applications through Google Play Store.
Therefore it seems Google Play Store is a must for GCM to work.
Pushy is an alternative to GCM that does not require a Google account nor Google Play Services.