>> They still import a lot
I don't think it's common knowledge how much they dropped imports since the Iran / straight of hormuz crisis.
Back at the start of that conflict there were a lot of breathless takes about what catastrophe was in store in a few weeks time, and what materialised was bad but not in anything like the same league as what was predicted.
The thing that wasn't accounted for in the analysis at the time was just how rapidly and by how much China could suppress its appetite for oil imports.
They had basically been planning for this shortfall for ever as a likely outcome of sanctions/blockades during an invasion of Taiwan.
Curtailing imports so much is a smart soft power move in not only does it ingratiate countries that would suffer most from the price spike but it could soften the resolve of Taiwan in showing that one of the largest penalties that would result from the invasion isn't nearly as punishing which in turn makes Taiwan's porcupine strategy less viable.
Along with US own goals like the thoroughly bungled and unplanned invasion, tariffs, corruption (both business crimes and more moral crimes like pedophilia or disregard for following legal process) it's made most of the west rate China above USA in favourability [latest Pew research poll].