the tariffs are not on all gold imports - just on a specific configuration - 100oz/1kg bars this alone won't skyrocket the price of gold, but it adds to the existing breakout pressure
tariffs on gold decentivize gold imports higher import tax is a disincentive. not sure what' the benefit to having less gold come into US there's plenty of buyers in Asia who will happily take it. soon you will see more central banks expanding their balance sheets with gold