He is always saying price has to follow hashrate/difficulty...
Yes, in other words:
miners decide the price.Again this is wrong. Miners don't make the price!
I'd guess you're the noob who made this video right?!
Miners have no influence of what the price of Bitcoin will be, except dumping the coins to the market they hold.
It's not the miners who give Bitcoin it's value. They are just 1 part of several more with much more significance!
So are you saying that the effect of losing the miners to BitcoinCash will not have a significant price decrease? I believe it will because if let us say 30% in Bitcoin's hash power suddenly is gone, the difficulty will take some time to adjust and it will make the network slow and confirmations will take a lot longer.