Probably you are talking about diversification asset with a few altcoins to minimize the risk trading. But the reality you from price movement provider,none one of altcoin has a correlation positive against BTC went the correction/rally was happening. Went the bitcoin price was up or down, the value still gets downs USD/BTC pair except for stable coins, the coins/token volatility cant be tracked, probably could be more/less than the past history, however, i don't really agree what has been explained on the website.

The conclusion from me, it's not really gonna minimize your loss with diversification assets on a few altcoins.