W.O. Dielectric or Aluminum Enhanced Diagonal Coating?

What is the difference between a Dielectric and Aluminum enhanced diagonal from WO?

I have a WO-DIG2 AE

I have seen plenty of info on about reflectivity rates and numbers. I realize this maybe a very basic question, however I cannot find anything
in the way of specs from WO on the Aluminum enhanced units.

I looked some info up on the net and this came up...

http://www.opticsplanet.net/william-optics-wd-dig2.html

The above link suggest that the AE is DIELECTRIC, but is does not have it written on the Diagonal itself.

I can't seem to find anything on WO website about these two topics.

Any input?

Dielectric is non-metallic multi-layered (50 or more) coatings and enhanced aluminum is metallic aluminum with an overcoat.