The tinyurl is definitely dead - I suspect it's just cached on your machine.

However, I did get to the URL using the other link, and it would appear that this is a link off the Catalan (!) version of the Ryanair web site which I presume they must have forgotten to update when they changed their rules. The link that comes off the UK version of the web site makes no mention of having to have been born in the EU/EEA, and when you book from the UK then it's obviously the UK version that counts.

I think I now have a fairly good idea what may have happened, and I suspect it may have been incompetence rather than malice... my guess is that Ryanair DID have this restriction once upon a time, that they (quietly) abolished it when it was pointed out to them that it was illegal (you just cannot discriminate against British citizens based on their place of birth), and that they forgot to tell their staff at STN that they had abolished it.

If things are as I suspect then Patti might even stand a chance of getting her money back without having to fight for it... (or am I being too optimistic?)