"As far as the growth of government, the increase in spending, on restrictive regulations, it was two-and-a-half times under Bush than it was under Clinton,"
On fiscal issues, Koch is half-right. "Moderate" Democrats like Clinton give us more or less the same economic policies as "moderate" Republicans like Bush.
However, Koch doesn't even know who the GOP nominee is going to be, so how has he preemptively decided that he would be as bad or worse than Hillary? Cruz is basically on board with the Koch economic program of low taxes and free markets, and so is Trump except on trade.
Most likely, for the Kochs like for most libertarians, free trade is more important a litmus test than any other issue. They'd rather have higher taxes and regulation under Clinton as long as they get no tariffs on Chinese goods than tariffs combined with an internal/national free market with Trump. That's the lunacy of some libertarians.
We already have Tariffs on many things coming from China. And, from other places as well. It's not always a good idea to listen to a candidate... especially an insurgent candidate.... who spouts stuff that we like. What they say isn't always accurate. It's always a good thing to check stuff out.