Well, what exactly has changed...?

[Starz]

Or maybe not flown, just too high.

 

[Goof]

Not really. Those are speeds for free fall in a vacuum. The terminal velocity of a P4 in the atmosphere is far less than that, but very hard to calculate.

In practice, works out to be around 75KM/h....

 

[SkyHog]

In practice, works out to be around 75KM/h....

That sounds about right. And yes, that works out to be about 47 mph, which is far less than either 90 or 180 mph, but certainly still fast enough to ruin the day of anyone in the path below.