Thank you for this - the article had me wondering: if they are putting the PMMM film over glass, what's the point? - any extra transparency from the film will just be negated by the glass, but in the paper it appears they have developed a PMMM panel that they used in testing.
The film doesn't create extra transparency, just the opposite, it's a diffuser, it's translucent. It lets light through, but details aren't visible through it. The interesting parts are the radiant cooling and the self-cleaning. However, it's just a thin film, so it needs a substrate like glass to be practically useful.