Everyone can form an educated opinion on what’s going to happen in the future. You might even say you “know 100 percent” how something is going to end. But having excellent skills in prediction and knowing a subject well enough to “predict the future” is still not the same thing as clairvoyance.
Clairvoyance is quite the opposite. I have special insight into future events when I have no previous experience or knowledge base to fall back on. The information seems to come from the “divine”, or at least some kind of supernatural ability to perceive future events.