Nice article! But, however, HOLD is the sanest advice in certain circumstances.
In the article, he made a simulator for you. The simulator uses the right data from the exchange to make the backtest for the past year.
Well, what I believe is, sometimes successful strategies in the past don't work at other times. Analysis and following market trends remain my guidelines.
If the situation forces me HODL for one year or more, then I will do it.