I guess he means Europe the collection of states which is in the geographical continent. Which the UK is also obviously not leaving. And which is totally uninteresting since a "collection of countries" do not have a common interest, nor a common policy, nor a common market, nor a common anything.

The "Countries of the European Continent" have exactly the same international clout that any random group of world countries: without structures, without organization, without agreements, a bunch is just a bunch.