Amusingly, smokinliver appears to be wrong (I literally did a Google search for “side view of a healthy human brain” and got OP’s pic): https://sciencephotogallery.com/featured/side-view-of-a-healthy-human-brain-garry-watsonscience-photo-library.html

Edit: wait, is the joke supposed to be that it is not a human brain? That OP found a not-human brain labeled as “human brain”, therefore demonstrating the Dunning-Kruger effect? I’m confused.