Yes. The walls are 2 X 6 construction and there is fiberglass batts.
There is a strong breeze coming from the entry panel for the whirlpool tub. Looking underneath the tub I see 2 mil vapour barrier which is not stapled or caulked with acoustical sealant to the sill. It is just hanging down. Don't know if this is indicative of the rest of the walls or just the tub enclosure.