As I said. It's an extrapolation of the rules from once upon a time to a totally different approach. It's marketing and increasingly subjective. Any number can "make sense" in that context. The number isn't based on anything you could actually measure for a long time now, it's already a fiction, so it can go wherever.

People have accepted heat pumps as 400% efficient. This is the same.

And realistically, how do you describe in an approachable way “you experience what would look like an impossible number if we had continued as before”, where the “if” is key, as is “you experience”