Has anyone witnessed any radiant AI?
Or, perhaps it is happening all around us without us knowing.
Or, perhaps it was a lie?
Thoughts?
Firstly 'Radiant AI' was in Oblivion. In Skyrim you have 'Radiant Story' which is similar but different, it's not just the AI. Secondly what do you want as "proof"? The code?
Thirdly, "Radiant" is, just like every other aspect of every game, a name that players have decided to make their own minds up about, and if Radiant Story doesn't fulfill every aspect of their assumptions and fantasies, it's a "lie" or "false advertising"
Next, each thing you do is considered by the system. The game stores info about what you do, where you did it, where you've (and where you haven't been) and allows the story to change based on that
To summarize, not only is it happening without you knowing, but that's the entire point. It wouldn't be very immersive if you got on-screen messages that read "Radiant story now determining the outcome of your actions", now would it.