It might be a coincidence, but it's not the kind of coincidence where you can give a number that sounds like a legit prediction but is sure to be correct at some point in time. Which you seem to have implied in your post.
Had he given a number above $20k he would't have been right at any point in time. And bitcoin might have never hit $10k, which would also left him being wrong.
Which is less than half of the peak value, I don't know what your point is? If we were having this conversation a year ago or a year from today, his guess would have been way off. That's why its a coincidence.
