I am already doubting that claim.
x20 of a polyhive? Don't think so. Need some 'U' values (or the other reciprocal one) and dimensions to verify. Doubt if PVC is anywhere near the insulation value of expanded polystyrene, and materials like that are likely filled with a different foam material anyway. Which means that air (or any other entrained gas) is the real insulant.
Could be compared to wood - but again, no details - and wood can be improved by some very simple insulation techniques.
For example replacing the outer frames (of a 14 x 12 or brood-and-a-half standard National with expanded polystryrene migh near halve the heat losses through the side walls, a sheet on the outside would reduce things even further and a sheet over the crownboard would make it effectively a poly hive!
Are you marketing this type of hive, BTW?
Regards, RAB