I did email and ask specifically if they would provide support, they said "no problem," but as you say you never know until you have a problem. But the units are built like a tank so agreed this is pretty theoretical.Nice purchase!
If you also pay for vSZ & vRIOT then Ruckus will let you use the IoT radios.
Just to temper your expectations, I've also had no problem registering my used APs & ZoneDirectors for warranty & support. But when you try to RMA or raise a support request then they'll insist you provide proof you purchased from an authorized dealer or are the 1st purchaser of a Lennar home.
On the other hand, after buying ~300 used/grey-market APs I've only had one AP die on me. So this is a largely theoretical problem.
A vSZ and vRIOT I think is more than what I paid per unit.