General Discussion

In the days of my distant youth, the items in those Cambridge Dictionary examples might have been described as an "incredibly good performance" or an "incredibly fast motorbike". Now, due to long misuse, even the astute and fastidious might say that the performance and the motorbike themselves were somehow not credible.

It's much like the meaning of "hysterical". A joke might have been called "hysterically funny", but those who didn't understand or care what they said eventually began calling the joke itself hysterical. (How can a joke, and not a person, become hysterical?) It might well be that this definition has also been changed. I tremble to turn the page of my (virtual) dictionary to that word and find out.