I am not convinced of this.

All decks sound better when they arent put somewhere wobbly - whether they are suspended or non-suspended.

Its my opinion that neither I nor you could tell the difference between your deck when placed on something massively solid (like a fireplace-base or a solid rack on a concrete floor) and the isolation platform that you have in the same room.

I think IF you could hear a difference in my example (doubt it) then it would be described as extremely marginal.

If you have a wobbly floor then I can understand going to greater length.

Putting the turntable on something sensible is a good idea IMO, and I understand why you'd want to get the most from a very expensive deck.