Am I misinterpreting this, or was your rabbi recommending that you deceive people?

This is how I read it as well. If the rest of Judaism is like this I might consider converting to it.

If you deceive people that that demands truth, do you become rich and become enemies?

maybe but you wont get to keep it because the people you fooled will try their best to not let you have it which is what happened to SBF. I'm trying to point at the analogy to crypto here. everybody believed in something that wasn't but badly wanted it to be true. somebody sold them that false reality and the capital moved from people who were living in a false fictional reality to people who never left this reality.

There is a huge difference between demanding something and badly wanting it.

yes the spelling is different.