I wonder if that is the reason for the Kapton tap between the aluminum build plate and the heat plate.

I am ok with Kapton tape, but am really curious if there is a better way to transfer the heat. From what I have been hearing/reading, It sounds like have the aluminum build plate sandwiched between silicone thermal transfer pads may not be a great idea. They don't say way though. Sound like it would be a great method. go figure.