The geometry of plate movement isn't what affects the kind of apparent solar time changes that leap seconds address. We do, however, take plate movement in to

The geometry of plate movement isn't what affects the kind of apparent solar time changes that leap seconds address. We do, however, take plate movement in to account when determining positions of things on the surface. Geodesic coordinate systems periodically publish 'Datum' that are the result of new surveys of positions. In some places, such as Australia, the difference a decade can make is pretty large. Other places, not so much.