It's really more that the (narrow, academic, theoretical) Laffer curve provided cover for the Reagan admin to cut taxes in the ways their backers wanted, but this is admittedly unproven AFAIK. But then there's the observable fact that the Reagan cuts weren't Laffer-optimal either (revenues went down, not up). It's not clear that there is a Laffer-optimal tax cut that can currently be made, but instead of making a case for that it has just become "centrist" dogma that lower taxes always increase growth and revenues, and are always optimal no matter the actual fiscal or economic situation.

I think the more interesting observation is that neither Clinton, nor Obama, nor Biden made any effort to roll back the biggest part of Reagan's tax cuts: reducing taxes on the middle class. That's quite remarkable, because that's the area where the U.S. diverges the most in tax policy from other western countries.