I owned a successful business for many years and can tell you that tax cuts had zero effect on the number of people I hired. What DID increase the number of people hired was increased sales volume.
When you give a tax cut to a billionaire (and I certainly was not one of them) history has shown that money goes into stocks and other investments for the most part.
When you give tax cuts to the lower class, that money goes immediately into purchasing additional products and services that were needed but they couldn't afford. And THAT creates additional sales which creates jobs.
The wealthy GOP liars are fully aware of this and probably can't believe how stupid their party members are to believe such an obvious lie.