Checkboard, Re; “it never existed.”
Where’s the evidence? Myths should be exposed if untrue, or is this one misunderstood?
Re your; “The aquaplaning speed is determined by the tyre pressure alone.”
According to many experts this is not entirely correct; the depth of tyre tread and runway surface texture are important parameters.
For a myth, then consider the ‘classic’ equation 9_/Tyre Pressure as the ‘aquaplaning speed’. An important aspect is the tyre spin up speed which has been shown to be much lower e.g. 7_/Tyre Pressure.
I would encourage you to read the links in #11.