I don’t think you can call airtime strength, speed or anything of that ilk to do with a ride a fact for a number of reasons.
Firstly, there are all sorts of factors that can make two rides on the same coaster vary a lot; for instance, if you rode Wicker Man at 10am, in the front row, on a cold morning, I’d wager that the ride would feel different to how a night ride at 9pm, after it’s warmed up for nearly 12 hours, in the back row would feel.
Also, our brains perceive forces in different ways, due to a variety of factors. For instance, things like your levels of sleep the prior day, how hydrated you are, and simply how your brain is wired can affect how you perceive forces and sensations. Two people could perceive the same force very differently, simply down to biological or extenuating factors.
Furthermore, raw force and speed figures do not dictate how intense a ride feels on their own. For instance, Galactica and Nemesis technically have the same maximum peak of positive g-force (3.5G), and a not dissimilar maximum speed figure (Galactica is 47mph, while Nemesis is 50mph). However, most would agree that those two coasters ride very differently. How a coaster rides boils down to things like rate of change of force, and the amount of the ride for which the peak g-force is pulled, as opposed to raw force and speed figures on their own. It isn’t an exact science.
But all in all, it boils down to opinion and individual perception. Even when two people are riding the same ride together, they might perceive it very differently. What is truth to one person may not be truth to another.
EDIT: Basically what
@Thameslink Rail said!