Good way to promote further inequality.
I think you're right about the intent, but even giving him the benefit of the doubt, he's trying to get the poors to leave and the richers to come in. And that may happen a very little, but Republicans grossly overestimate the effect that tax codes have on people in the real world. If taxes were that important, there would be very few high earners in NY and CA and many in my home state, which has no income tax on earned income. Instead, you have the opposite. And you have a lot inequality based problems. But that's the South for you.
1. Louisiana pols have the idea that New Orleans thrives on its tourist industry, and that high sales taxes hit Chicago tourists more than they hit the poor. Such is a common misconception about the sales taxes. In most places the customers are locals -- especially in a large metro area. Maybe ski and beach resorts fit that description, but that is a poor argument even for the city that is the biggest tourist attraction of all -- New York City.
2. Sales taxes as a rule disproportionately hit the poor -- especially if food is not exempt. But even without taxes on food sales taxes hit the poor for utilities (even if those are furnished by the landlord who can pass the cost onto renters), gasoline, clothing, and housewares -- let alone fast food meals and cr@ppy used cars that the rich do not buy. This is an iron rule. Sure, the rich buy luxuries, but they aren't spending every last cent that they get to survive. The fellow paying cash for a new Mercedes almost as a rule is not paying as much a share of his income on automobile costs as the fellow who buys a succession of clunkers from tote-the-note rip-off places.
3. I don't see how Louisiana could be a favored destination for well-heeled retirees to live. Housing costs are high in the only city with any semblance of a cosmopolitan culture. Miami has more to offer at that. Winters are still decidedly winters, so the state doesn't attract the snowbirds.
4. The tax structure of most southern states shows the heritage of the plantation system. Self-contained plantations as a rule had no cash economy for those who worked there -- they got payment in kind and often the castoffs of the elites. The only time that anyone ever got cash was when the planter got revenue from selling cotton, lumber, cattle, rice, tobacco, or some other cash crop. The plantation as a rule grew its own staple crops for local consumption, and about the only time when a planter spent money was when the family 'imported' some luxury goods (which could be taxed), more property (not taxed), or in the really-old days slaves. Of course the planters who dominated the plantations did not face an income tax.
But anyone outside the plantation did pay taxes on just about everything. Independent commerce and industry could never flourish. But who needed independent commerce or industry when King Cotton dominated the economy and made a great life for the planters, the only people who mattered in the Natural Order of Things? After all, economic elites have little use for an independent middle class whether shopkeepers or government employees. When one can pay such people as clergy in chickens and flour... get the idea?