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Yes and no. Give someone earning $7.50/hour more money and it gets spent and put back into the economy like you said. Give someone earning a base salary of say 500k more money and it gets put into a bank to earn them even more money, taking it out of the equation.
I don't support trickle down economics, but it's not the case that money in banks is just sitting around in a vault. The banks actually do stuff with the money. For example it's loaned out to real world businesses.
They don't take money and lend it out. They create money, lend that, and then remove that money as the capital (loan amount) is repaid - or when the loan goes into default.