Reading the article we can reach to the conclusion that Bitcoin is the currency to be invested. Use the biggest part of your money to buy Bitcoins and hold it, if you want to invest in another Crypto-Currencies use a small part of your money to do it. In the case of China, the country regulations can make the price fall or rise, that is important to observe also.
I don't think that this is the key message of the article. The ideal thing to invest in may change and Bitcoin will just be a great currency, but the article is more focused around any long term investments you may choose to make, with its focus mainly being on keeping safe by never being naive enough to think you can just instantly become successful in this, and I think that many people responding to this post are being the naive people that he considers in the article - people who think they can tell you exactly how high Bitcoin is going to go when they can't say what it'll be tomorrow.
Nothing is 100% stable and people need to be careful.