Randy,
If you look closely, those exclusions are listed under “above ground warranty exclusions” which applies to “above ground” PT lumber only. The ground contact (GC) PT is a different animal, as you know 
The whole purpose of GC PT is to be installed in areas of ground contact (soil) or conditions which could simulate ground contact. I would be careful if and how I call it out if it is indeed a GC PT plywood, even though it won’t last as long as CMU.