Doesn't help that the oft-conflated term "ambrosia" actually refers to the food of the gods, not the drink (but try using "nectar" these days without invoking thoughts of flowers, it isn't easy).
And the Rorschach comment is so bizarre that the rest of the story can't even support it! I mean, from the very beginning you have Bullock's "artist" comment, plus all the noted deliberate symbolism that comes to light as the story progresses, and all of it points to the bat-skull being just as much a Rorschach as the Mona Lisa! In a cut page, Aerons goes into detail about how about how what makes the thing important is the culprit's interpretation, but it's clearly more about the intention.
I'm tempted to believe Aerons only showed up to spout nonsense on purpose in order to ruin the investigation so he wouldn't be caught. That or he would be the worst art critic.