Apple’s MapKit most definitely supports vector tiles, because you are given a CGContext to draw with. You just have to implement the MVT spec (it’s small)

The idea is to use "MapKit" for maps, not to override it and draw everything yourself... The fact that it's possible doesn't mean it's a good idea.

It is however possible to use Maplibre, Mapbox or some other libraries which I think do support vector tiles.