Hi Fran,
In a word … no to both questions. You can read a little more about all the different types of latex in this article (which has a video of a 50 year old Dunlop latex mattress) and in post #6 here. There is a lot of misinformation about the different types of latex either online or from some retailers that sell one type and not another and overpromote what they are selling.
You can see my thoughts about Gold bond in post #4 here and the posts it links to.
The Cirrus uses all high quality materials and there are no obvious weak links in the mattress. The quilting layer has under an inch of polyfoam which is within the guidelines I suggest of “around an inch or so” or less. The base layer of HR polyfoam is probably high quality polyfoam (they don’t specifically mention the density) and wouldn’t be an issue in terms of durability. If it really is HR polyfoam (2.5 lbs or higher) then this is the highest grade of polyfoam. Of course it would still be important to make sure the design was suitable for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) regardless of the quality or value of the mattress.
If you removed the bottom layer of polyfoam it would change the feel and performance of the mattress to some degree but you could always ask them.
Phoenix