It’s not. But neither is it remotely sufficient. It is, after all, when the spec is literally in a fall-back, inactive, or otherwise ‘below-intended function’ state.
No, it’d be more akin to testing the top speed of a vehicle after removing two of its wheels.
Yet there is no mention of portion here. Nor did they nerf the BW windows. This means simply that they felt the spec was weak overall but simply managed to look okay during BW windows… for which reason they buffed it as a whole (which, yes, incidentally includes in its BW windows).