Sorry, but that is out and out wrong. Of course there can be discrimination when it comes to health and safety:
-There is no physical reason why any of the banned people can not ride
-Disability discrimination IS overridden by H+S - it would be dangerous to ride if you were unable to brace yourself and this can not be be made safe with any reasobable adjustments by the park. So it is fine. This is in no way the case here.
-'If the ride host, operator, management team or ride manufacturer do not feel fully confident that riders will be safe, they are not allowed on.' Fair enough. But as there is no physical difference between those being allowed and not allowed on, which is it? Is the ride safe or is it not safe? Open it, or close it depending.
Here's a fact for you, African Americans, on average, are much less able to swim than the rest of society and are 3 times as likely to die by drowning than the average. Under the same thinking it would be much safer all round if Neptunes beach was white only, would it? Just in case, you know, manage some risk. Of course that is absolutely not acceptable, you have to trust people not to get themselves in a situation where they drown.
I have no doubt Thorpe think they are doing the right thing, but they are wrong.