Hi will10025g,
The wool mattress pad you linked looks similar to the snugfleece which is one of the choices mentioned in post #3 here (which I should have linked in my last reply). I don’t think its the same though because the snugfleece has straps and the one you linked appears to have corner pockets. The listing doesn’t mention the weight of the wool which is a good way to make comparisons (the 1" snugfleece has 40 oz per sq yd) but it appears to have good value. You can see the equivalent (at least by pile height if not by weight) in the snugfleece here. The polyester blend backing is used to make it washable because a cotton backing (like the snugfleece elite models) will shrink if they are washed.
The Dormeir is much thinner and is more of a mattress protector than a pad (7.5 oz / sq yd). It has wool inside a cotton cover and is very high quality and stretchy but wouldn’t have the same plush surface feel of the one you linked. It’s very good quality but they would be quite different in function and feel.
Thanks too for your research and the links to the platform beds. If you get any more information about any of them about slat spacing … and also making sure that they have center support to the floor in the larger sizes … it would be great if you could add the information here. As long as the slat spacing is good and there is center support they should work well (assuming they were designed to hold the necessary weight of the mattress and people which shouldn’t be an issue). I’ll also link your post in the foundation thread so that others can see what you’ve found as well 
Phoenix