Temu should already be paying the tariffs on China-origin goods. De minims for China origin stuff ended May 2nd.

Unless they’re sending it all via China Post and US CBP is letting it pass through anyway. Anecdotally, most of their stuff in major cities is arriving by Gig couriers or from US warehouses (ie: not postal imports) = tariffs applied.

Where Temu and big retailers win the game is that they can structure it to exclude last-mile delivery/logistic cost in their tariff calculations, and that’s a lot of the price.