I'm quite sure you're being facetious, but I'll respond anyway.
The point was that the economy did very well during times where taxes were supposedly "high", and that government revenues were also higher than they had been with lower taxes. Not that taxes were responsible for the economic growth. It was never stated that there was a causal relationship between high taxes and prosperity.
However, it does seem to effectively refute the idea that the higher taxes will stifle productivity or innovation.
