You seem to have a misunderstanding of what the condition "concrete" means.
He's not saying there's no way of judging intelligence, he's just pointing out there's no universal agreement on what intelligence even is.
Edit: To add, this discussion becomes pure semantics. On one side is a strict definition of AGI, on the other side are the most generalized definitions of artificial intelligence. It gets kind of silly because technically, every "if" statement is a type of "AI" by the loosest definitions.
He's not saying there's no way of judging intelligence, he's just pointing out there's no universal agreement on what intelligence even is.
Edit: To add, this discussion becomes pure semantics. On one side is a strict definition of AGI, on the other side are the most generalized definitions of artificial intelligence. It gets kind of silly because technically, every "if" statement is a type of "AI" by the loosest definitions.