According to him, his current real bankroll is about 10 BTC,
He was using a 100 BTC initial "test" bankroll on a testing account. And that is what he is/was using to advertise the 900% ROI.
That's not what he says on his graph though, is it? He's obviously misrepresenting his accomplishments. I just wonder what else he is misrepresenting.
The confusion about API being private keys come from the fact that (my guess), in his mind, you can store crypto on an exchange (this is a bad idea !!). And since the API can give you a backdoor access to the funds held in the trading account, it acts sort of like a private key.
Obviously he is wrong, his terminology is wrong, but I can understand the analogy. Not too far fetched.
If i was to explain to my grand parent what an API is, I could potentially use the same type of explanation.
I wouldn't. An exchange is more like a bank, with an API key being your debit card, and a private key is more like a safe kept at your house for which only you know the combination, but whatever.
I am not supporting him, nor defending him, I'm just staying open minded and going to try it for a month or two.
If you pay him money you're supporting him.