Yup. They used to shoot 1/2 pound foam into molds lined with baggies. These pillow-like things were added last, after the tub was complete and ready to ship. No, these were not thermal pane spas, they were just poorly insulated spas.
They had a lot going for them: The jets were amazing, the pluming didn't create any water noise, you could shut off one or more jets - depending on model - to amp up the remainin jets. They had blowers, I'm not a big fan of the things, but these were very quiet and did the job well.
The control systems were all relays at the time, and not very good relays. But they worked well, until the first relay went out. At that time, it was best just to replace the entire wiring harness and all the control relays, because you were going to have to do it sooner or later.
As I said, they have come a long way since then.
One thing hasn't changed - at least in my opinion: they make a very nice-looking tub.