I'm sure some here that has the car in hand can answer that for you - I'm picking mine up this week. But if it's like the Air roof, then it's some kind of safety glass.
Also important, is to get the windshield tinted (which is glass). The 70% is the lightest they have, and it may technically not be allowed in your state, but it's really not noticeable. The roof glass already has a factory tinting. I would go with 70% on that too if you want to have more visibility, but 50% also works, and you still won't notice much light reduction. Many tints boast about UV rejection (which the Lucid glass already has), but what you are looking for is IR or better TSER rejection.
As for PPF, my installer (Cactus Auto Tint) uses the Clear Guard Alpha PPF and says that it's only a few hundred dollars more expensive than the best XPEL. It really has a great liquid shine and has ceramic coating built in.