Question about Cosori Turbo Tower

The air fryer uses a ceramic non-stick coating that is explicitly PFAS-free, meaning it does not contain PFAS or PFOA chemicals. It also does not use Teflon or other toxic chemicals in its non-stick surfaces, making it a safer, non-toxic cooking appliance. The plastic parts are BPA-free and meet FDA food contact standards. Overall, it is designed to avoid harmful substances commonly found in traditional non-stick cookware.

Yes, according to the manufacturer, the Cosori Turbo Tower deep fryer is PFAS-, PFOA- and PTFE-free.
The non-stick coating does not contain any known toxic substances.
The ceramic coating is made of aluminium, not stainless steel.

And under the ceramic coating, is it aluminium or stainless steel?