Nobody will sell bitcoin for a price lower than the exchange price. This is because he can just sell at an exchange.
He's probably referring to the exchange's Bitcoin selling price and not Bitcoin's traded price.
The selling price of BTC as per Binance's classic trading platform, for example, is already at $11,786 right now. But it's not the price of Bitcoin if you are to directly buy from them and not trade. If you are actually buying BTC, not trading, using bank deposit or credit card you will certainly be paying a much higher price. However, if you prefer to buy through their P2P, it may happen that the price is actually cheaper. You can actually buy BTC at $11,450, that's lower than the traded price and way cheaper than Binance's Bitcoin selling price.