Huh? For the most part taxes and revenues are identical (unless they want to spin them as premiums for political reason). Are you talking about reducing tax rates while increasing the size of the pool to increase revenue?
He is talking about trickle down economics, proven not to work in this context. Big reason the US is in so much more debt at the federal level (lower taxes anyone).
Economists have put numbers to the Laffer Curve, peak GDP growth is somewhere around 35% taxation (not peak tax rate but overall rate). Peak revenue is at 70% taxation. We are already (just) on the low side of the 35%, any reduction in taxes will reduce growth. Back when these concepts were first floated no one could predict the curve other than zero revenue at 0% taxes and 100% taxes, we (well some) know better today.
In the end GDP growth is a complex thing. One of the things trickle down economics theorizes--that cutting taxes will give more money to the high middle, wealthy and to businesses that will then spend all that money back in the economy... problem, not all that money is spent and some of the money that is spent is spent outside the country (not all contributes directly to GDP and economic growth).
Technically almost every dollar the government spends (even completely wastes) contributes to GDP. That is why 35% is seen as the peak for GDP growth. Sort of a sweet spot between revenue for spending and money left in the economy for the private sector.
Another simple (very simple) angle, if say we had 90% tax (we do not BTW) the tax is stifling the economy, lets say the resulting the economy is 100x, the revenue will be 90x. If we dropped the taxes to some lower rate, say 50% the economy will grow. The new economy is say 200x, so revenue is now 100x (lower taxes, larger revenue).
But if we have a marginal personal tax rate of ~33% and a corporate tax rate of ~25% and we cut them, the results are not increased GDP growth, it is slower growth (Laffer Curve).
Now I say trickle down, the proper term is supply side BUT that would imply something less bonkers...