Humans are the ceiling at the moment yes, but that doesn't mean the ceiling isn't higher.

Science is full of theories that are correct per our current knowledge and then subsequently disproven when research/methods/etc improves.

Humans aren't special, we are made from blood & bone, not magic. We will eventually build AGI if we keep at it. However unlike VCs with no real skills except having a lot of money™, I couldn't say whether this is gonna happen in 2 years or 2000.

Question was if cobbling together enough special intelligence creates general intelligence. Monkeys has a lot of special intelligence that our current AI models can't come close to, but still aren't seen as general intelligence like humans, so there is some little bit humans has that isn't just another special intelligence.