You're probably right, it's probably more of a psychological issue than an issue of randomness. Perhaps his users simply trust dice more than they do "atmospheric noise with a certification of randomness across sliding windows", even though minor imperfections in dice (and dug-out pips are more than minor imperfections) will cause them to be much less fair.

That said, it would be really interesting to see the referenced thesis-like papers. Or use high quality Vegas dice for awhile and compare the outcome of those to the purely random data.

That's discussing a different dice project - what's the connection to this one?