I also know people who do things. They all swear by their things. Doesn't mean they have any idea better than the next guy.
I saw it years ago, get a few guys in a chat room, get them to make calls, different methods, different calls, often apposing, you come back few years later they're still there calling against each other and everyone of them is making money and they'll all swear by their calls, even though it's derived from different methods.
Reality is it's not their calls that's making the money. Investec proves this every year, guy in a monkey suit throws darts at the newspaper to select the shares for the portfolio and every year the monkey beats the best minds in the industry.
So your buddies methods, the next guys method, the guy in the monkey suit's method, all the same more or less. It's a reason to get in and then the work starts.
Sure you can get futures volumes, but that isn't the whole fx market is it ? It's just another derivative on the underlying.