The most important part of --- is patience, and patience and patience, invest and lock your private keys, and forget it forever, and remember my friends there is no way anyone weather it is miners, or traders, investors, can manipulate the price of bitcoin.
That is provably false, and I am not sure if that link you posted is safe.
Your "advice would lead someone to buy a bitcoin at $19,500 in Dec 2017 and "forget it forever". That is very similar to much of the faulty advice that most people receive in bitcoin and crypto. Simply buy into something without any knowledge of it, throw it in a drawer, and forget it. Completely reckless.
Miners, investors, traders, governments, and institutions all have the capacity to manipulate the price of bitcoin.
Check out my site if you want actual information not strange advice like "forget it forever":
https://www.amsinger.orgAaron