For example take a ATX or mATX mainboard. It has multilayer circuit (not 2 layers), the oscilator is greater and there are more circuits than on the K16. The power feeded into the board is huge compared to K16. Not to mention the power filters and transformers.
So I assume that the circuit traces of the K16 are not enough to emit EM interference so that the values are greater than FCC aproves.
And let's keep in mind that those values are given at 1 meter from the device You will not sleep with the k16 boards.
In my opinion this is somewhat not important to discuss since there is more EMI using a cell phone. And if you decide to have a "farm" of k16 they will probably be placed in a location far or away from people (due tot the heat and also to prevent accidental intervention).

And anyway we are discussing about an experimental device. There are lots of things to improve and this is only one thing of them