Very well said. Is it even possible to quantify intelligence? I mean, you can obviously measures brain size, which they did, and that was lacking, then they measured amount of gray matter, which matters a lot more, conclusively, but there is also the fact that even losing pieces of the brain cannot stop a person from being fully functioning due to neuroplasticity, and then you have concepts like IQ tests which are verifiable steeped in white exceptionalism aka racist as hell.
There is a primate that washes their fruit off and it is a learned behavior. They have taught all the other in the species to do the same thing.