This is kind of an annoying way of presenting an argument. I'd rather be able to read and look at the animations at my own pace. That aside, to the main point,

This is kind of an annoying way of presenting an argument. I'd rather be able to read and look at the animations at my own pace. That aside, to the main point, I don't think it is really an argument against lowing nominal rates, but rather an argument against lowing effective rates. Classically tax reform is involves broadening the base (eliminating exemptions, deductions, credits, etc) while lowering the nominal rate. That may not be what the Republicans are planning on doing, but won't really know until the details are hammered out.