From the pics it appears that they are at a base with a paved runway. They could operate in STOL but wouldn't have to perform a vertical landing as they would from their normal shipborn operations.
VTO results in almost no payload even at sea level, so even aboard the ships they do a short take off. The Brits have a ski jump at the end of the deck that improves takeoff performance, but for some reason we don't have the ski jump on our ships.
Perhaps I'm wrong in assuming that Harrier flight ops consist of Short Take-offs and Vertical Landings? To me, the landing gear arrangement doesn't look conducive to a normal landing approach.