Yes, it is officially compatible. You use the smartthings hub instead of the Lumina gateway, as they use the same zigbee profile. 
And here’s a marketing document from Leviton which lists Lumina devices as being compatible with a smartthings hub. Leviton support can confirm this for you if you like, it is an official integration.
This is pretty common. The IKEA Tradfri devices will say that you need their gateway in order to work, but you can use the smartthings hub instead.
Sometimes the literature will say “or a compatible hub,“ but sometimes it doesn’t.