Bathtub Support Instructions using Mortar

In investigating a problem with the hydromassage motor (whirlpool motor) amperage, I discovered the bold print on the side of the tub.

No Mortar Tub Support

As you can see there is on support. He is the label I was looking at.

Tub Support Instructions

Here is what the builder did.

Tub Supported with Spray Foam

I don’t know if this would be acceptable by the manufacturer, but some things are not worth pursuing.