No reason to be confused, just watch the youtube video, John refers to BTC. Then remember that BTC comes from years ago, so if there is a fork BTC remains the main chain and BCH can not be perceived by the BCH noobs as the real bitcoin but only real Bitcoin (notice the uppercase B for the confused) Remember BCH split from the chain, BTC did not split from the chain. So BTC will remain for ever bitcoin.
BTC split from "The" Bitcoin chain via segwit.
BCH split from "The" Bitcoin chain via raising the block size.
Both forks implemented changes, thus while one kept the stock ticker of BTC and the infrastructure built around the BTC ticker on trade platforms, it is not inherently the defacto Bitcoin.
If BCH manages to maintain the majority hashing power and prices rise to support it, it will become the chain which is used and referred to as the main Bitcoin.
Obviously, this could not happen within the same day of launch, or week, or maybe even month or months. This will take some time to play out. Right now there is a great deal of uncertainty among investors, traders, and miners.
A great deal hold both of their coins, BTC and BCH and use BTC + BCH to calculate the overall bitcoin price, which is a sensible way of understanding this.