All the predictions in the article are hard to come true, it seems that they are too optimistic about the price of bitcoin in 2020. I have not seen any reason why Bitcoin can increase sharply in 2020.
I guess bitcoin will not be able to surpass $ 40k by 2020. The current cryptocurrency market is facing the opposition of many governments around the world, without the support of the government I think bitcoin will meet difficulties in 2020.