Hi darkarchon,
I doubt that they would release them because ILD is one of the comfort specs (not a quality spec) that would have little meaning to most people anyway. This would be especially true when you consider all the additional complexities of how the individual ILD’s and layer thicknesses of 3 layers will combine together with all the other specs such as compression modulus and others that would be part of how a mattress feels and performs (see post #2 here).
Their return policy gives people a way to try it with little risk and personal experience is really the only way to know how a mattress will feel and perform in terms of PPP.
In terms of the “quality” specs … their foam layers are in the 1.8 - 2 lb range.
Phoenix