Someone I knew once told me something that I will never forget...
'If it is too good to be true, it probably is'
Unless you can post some sort of proof, I don't think I will be able to believe you. I can't imagine you getting 17 BTC that quick.
If I were making bank using a strategy dependent on price reporting delays by an incompetent broker, I wouldn't say a word about it. Not to a soul. I would just quietly withdraw the BTC as quickly as possible to my own wallets and keep printing money. If it's true, this method won't last for long.
Otherwise, the only tried and true method I know is degenerate high leverage trading at places like Bitmex. More likely to blow up your account many times over than churn out 350x or whatever crazy ROI he's claiming.