I tried to beat the tariff with an order for a popular model shipped from a US Supplier, before even the first round was to go into effect. It shipped right away, received just after they went into effect. But no joy - there was still a $50 tariff surcharge added to the total. A buddy tried to buy a new radio, that was subject to a 10% tariff surcharge....luckily at the last minute he found a used version.
To the OP - the supplier is supposed to pay the tariff. They can charge you, or not, the additional. With the order to disallow the "de minimus" exemption for orders shipped directly, that means customs and others need to inspect and validate that the tariff has been paid. That is causing a huge problem in those areas - no staff, systems or processes, etc. to do this huge task. We'll just have to see whether there is a mountain of individual packages piling up at US points of entries in the future. Wait times may get "a bit" longer to receive your order!