If they use very different impedances in those holes, it could work as a diffusor, but if the backing is homogenous, it will only scatter a very narrow band.
Mind you, I'm a lowly audio engineer, they probably know more physics than I do.
Edit: It looks like they do...
"The absorption characteristics of the perforated panels vary depending on the distance they are supported away from a solid boundary. The closer to the boundary, the lower the overall absorption at higher frequencies."
Edit: A bit of research gave me this:
http://www.hunecke.de/en/knowledge/diffusors/phase-grids.htm l