Wow, this sounds pretty nice. I remember watching a MedCram video recently that pointed out that long wave IR light has anti-inflammatory properties and that modern IR blocking glass is actually depriving people of many of the beneficial effects of sunlight. If this could get people more IR, it could raise the bar for health across the board. Still, I have some concerns. It's a polymer nanomaterial, so it's probably fairly fragile. The "self cleaning" part is just that it's hydrophobic, which is nice but relies on the nanostructure. Again, probably susceptible to damage. The chemical itself, poly-dimethylsiloxane is pretty common but it appears that they're forming the nanostructures using a mould made via silicon lithography? That's not going to scale at all, nor does the coating seem durable enough for decades of outdoor use.

I only skimmed the paper so please correct me if I'm wrong but this is very far from production-ready.