This is especially funny because China didn't actually lower any tariff, China just asked businesses to identify a list of items that they source from the US that's subject to tariff, which Beijing will probably just help with impact mitigation.So if China lowers tariffs on US goods then the US will retaliate by imposing export tariffs on China.
*fixed
But because of that non-news they just opened a pandora's box of export tariffs, something China can and should very much do.