The criteria seem to be "attention, periphery, durability, light, sound, and materials". Very broad. It looks like it even addresses openness and repairability with "an instruction booklet with a list of replacements and compatible parts", something I really care about, but how does it relate to calm?
Maybe it will be clearer when the certification document is out.
You are going to find the attention grabbers really fast of course, that's the idea, but if you are like me, the list is relatively short. Smartphone, PC, and that's about it, you may have a TV and a couple of device with annoyingly bright blue LEDs, but now the things that aren't: toaster, coffee machine, kettle, washing machine, dryer, fridge, various tools, hairdryer, etc... These things are not so different from how they were 40 years ago in terms of attention grabbing. In fact, many have improved by being less noisy. Oh, and I don't have that bright red alarm clock radio anymore.