well I might have to backtrack

The JonnyBaak video does include concept art, but who knows when that concept art was from. The voiceover says that only art and the novel we'lre brought to Charlton Heston, but the accompanying visuals of Heston and the rest looking at the primitive 3D model ape village after the concept art, were probably chosen as visuals for the public and may not be documentarily important. Those concept art paintings could have been done at any time.