I do not know if you can believe in these predictions, everybody should do own research. I think that CEO of Binance is more trustworthy than CEO of Bitmex (He hates Ethereum so much). But these people are earning everytime, it doesnt matter if the market is down or up.
I also find him hating ETH and constant FUD. He says that ETH is a scam and will soon fall under 100$ and of course he lied.
I also agree that exchanges can make money all the time and do not care about prices. Whether the market goes down or goes up, The happiest person is the owner of the exchange