I think their point may be more thay sales taxes are regressive- they disproportionately impact people with less money, as those people need to spend all or most of what they have for necessities, while folks with a large surplus of wealth or income only need to spend a small portion and much of it can go towards savings or investments

I dont think its unreasonable for someone to say they’d rather just do away with sales tax altogether. We may have more appropriate tools with which to fund the government