Exactly. The whole response ignores the existence of consumer surplus. We can see the silliness by applying to the actual examples - since core-js brings in $16204 and is used by 2442712, by such definition it only contributes $0.006 in economic value to each user. Would any of them accept 1 cent - or even a full dollar! - in exchange for not using core-js?
You mean it doesn't capture the value. It may indeed contribute huge value without capturing it.