That's 1/4 the size of the texture of a Minecraft block. An AI could easily be trained to identify the block type of a Minecraft block based on an 8x8 subsample

That's 1/4 the size of the texture of a Minecraft block. An AI could easily be trained to identify the block type of a Minecraft block based on an 8x8 subsample of one of its textures, and there's no reason something similar couldn't happen with biological race. Unless you a priori assume all racial differences are socially constructed and/or only skin deep.