no, it is propaganda. I mean, “Taxing at 100% also brings no tax revenue” is already a stupid statement, and is Tautologically contradictory, even more so in a progressive tax system (please look up what the even means, statistically believing in the Laffer curve also comes with a ton of other misconceptions about financial policy)
also some history to the Laffer curve, it is an unproven theory that basically always get trotted out by the wealthy to argue for lowering taxes, tho it ironically has been shown to have no predictive power whatsoever.