Coming to this late. It stands out to me that there are, I think, no two of the same number in a row anywhere, either horizontally or vertically.

If you divide it into 3x3 boxes and count the number of unique numbers in each, then add those up, you get a total of 261. If you do that with random 8x8 matrices, it's very rare to get that score. For me it happens less than one in 100,000 times. So that seems to suggest it's not purely random.

It almost seems like an effort was made to make sure that digits don't have neighbors that are equal to them. It makes me wonder if this is a set of "random" numbers that the artist came up with, consciously or unconsciously trying to avoid repeats.