Comment by DrAwesome

Apparently so. On the Google Apps/G Suite (which is basically the paid business version of Google services, including Gmail) page about restoring a suspended user (https://support.google.com/a/answer/1110339), "You can’t restore an account that was suspended for abuse or for breaching the Google Terms of Service. To see why a user was suspended, click the exclamation on their account page for an error message. Then see below for your corresponding recovery options."