These take a minute. Hastily drawn stick figures indicate not a lot of time for such frivolity as detail. Someone with a full belly noticed the common stick figures didn’t really look like the depicted animal. He noticed depth and perspective. He spent some time expressing his detailed observations. That’s all they are. The artist had time for more than hunting and gathering. Maybe he was too noisy in the woods and would scare the game, so they left him in the cave. Just observations here, but you could go a long way before blaming autism.
Who's placing "blame" on autism? I didn't see anything in the article where "blame" was indicated.