Are you sure that it includes PC components, not just fully-assembled PCs?
Also, I expect cases, heatsinks, and radiators are still be affected by the 25% steel & aluminum tariffs, which did not get suspended.
Lastly, the "de minimis" exemption on small (sub-$800) packages ends May 2nd. That will hit anything shipped directly from abroad (AliExpress, Temu, some sellers on Amazon & ebay, etc.). I'm not sure exactly how that's going to work, but I think you'll be assessed a customs fee that you pay in order to pick up or receive your package. But, it's the recipient who pays. So, don't expect it to be incorporated into sellers' prices.