I assume from your comment that english isn't your first language and before anything else, I'd like to commend you for your clarity. I speak a couple other languages but nowhere near as well as your english.

In english, it's common to use hyperbole or colorful imagery sometimes. In this case, calling someone who made an accurate prediction an 'oracle' is colorful imagery. They're praising the accuracy of a controversial statement made five years ago that ended up being correct. Calling them an 'oracle' in this context is like saying they've exercised super-human prescience (ability to see the future).

This is the kind of thing that wouldn't be obvious to a non-native speaker (or, I suppose, a native speaker who hadn't made it past middle school maybe) so it's completely understandable, I hope my explanation helped.