I’m not saying this is necessarily what they’re doing, but they seem really experienced in FL / at Disney with removing mature trees and replanting them. Maybe the trees will be back (or maybe not?

).
Regardless I’d expect 1st floor of this tower to be common areas like restaurant, shops, etc. Guest rooms might not be ground floor except for the one little “wing” that turns south towards the parking lot / monorail track. This would be consistent with Riviera, which has just over a dozen ground floor rooms, only to the one side. BLT has very few 1st floor rooms too.
So the vast majority of lake-facing rooms should be at least 2nd floor, and 2nd floor at Poly can give a decent fireworks display, because they are shot so high in the air. Hopefully you can see past the glare, but this is a fireworks example from Tambu Lounge (2nd floor GCH):
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