If it were a sincere question, it would mean that he was unfamiliar with the concept of truth.
If it were, more likely, a rhetorical question, then it would imply that Pilate had contempt for the very notion of truth.
In either case, Pilate clearly had a problem with truth.
I disagree, Pilate's words still apply to this day, because there is NO consensus on what TRUTH actually is. This article proves that point, is there any question about the deaths of Armenians, and why is it still a point of contention?