1 year suspensions are not handed out for first offenses. The guidelines for mods are to give escalating suspensions for 7/30/365 days, so this is most likely at least the third suspension for this user.
This case could be different. Do you know he was suspended before? It makes sense that they'd want to ban him for a year if this is retribution. It all checks out. The email doesn't mention a previous ban which I'd expect to be mentioned if it was a factor.
