Well, both are true though for microwaves as we know them right now.

I got a yes for can you carry it…

I assume that is exactly for one of the reasons they mentioned in the article: increasing costs for sms

There is a difference between mirror like reflection and diffuse reflection. Mirror reflection is what you get with metal roofs which beam the sun directly to a target resulting in one spot being blinded. Diffuse reflection will spread it around, resulting in more light all around which is what we can handle as humans.