It is not. The US price pre-April 2nd ($450 base / 500 with Mario Kart) were right in line with EU and UK pre-order pricing.
With the April 2nd tariffs along with the retaliatory tariffs from China today, base US price would be north of $600.
*EDIT*
Switch 2 production is done in Vietnam, which is currently under the 4/2 tariff of 46%.
Base system would be $656.98, with game bundle $728.98.
The Vietnam leader did make a call to Trump to try to negotiate the tariff rate to be lower. Originally, pre 4/2, Vietnam tariff'd US goods at 9%.