The US economy has been growing fairly robustly, however, I think it is likely the impact of the tariffs hasn't hit yet. Most tarrifs have been small in nature and targeted unimportant industries.
You also have to understand that the US has a position of privilege over most countries it is slapping tarrifs on. Their is a very real likelyhood that the US will be able to find alternative sources for those goods, either from domestic or other international suppliers. Even if none exist, given the size and technical capabilities of the US economy, developing domestic alternatives is probably feasible... just no where near ideal.
Most tarrifs from other countries either haven't or just have started going in effect yesterday. Everyone else is following rules