I think it's great that you found someone helpful who can teach you to make a lot of money fast, and kudos to that person, I'm editing a video this week myself for folks to identify cores easily.
The reference is just a warning not to rush through your goals (and I apologise for the implied condescension, it's not intentional I assure you). A billion is a decent, but not life changing amount in Elite. Do you have plans for that first billion? Most consider a billion the poverty line, I'm a bit easier on myself and don't start panicking til I'm down to 500m, but soon you'll want a second billion as the first is rapidly chewed through witht hat Anaconda/Python or both you've been wanting. How are you doing with your first chosen superpower rank? How are you doing with the engineers? Cos honestly, in any real fight, an unengineered anaconda is just a big target waiting to get its modules wrecked. Do you really need to achieve that 1bn (which will soon become 2bn, as I say) now? Just trying to help, honestly. We hemorrhage players who rush through their goals and burn out, or realise that those weren't the right goals. Hence the proverb of not slaying all your 'foes'.