It actually took over a year because he posted this on may 2021 and the price of btc hit 20k on June the current year but yeah many people including me didn't believe that it will happen, I think that's because we only like btc to increase and increase more but we don't like it when it is dumping so we easily disagree on the topics like this most especially when the price or the market is still in good condition.

The only one that can make us believe is seeing the actual thing that happened but here it is, it did finally happen. The OP might only predict 20k but he can now be able to predict below then it since it is now very possible for the price to nose dive at any moment.