In other words, this was all for show.
Via ABC:
The sailing team that’s taking climate activist Greta Thunberg from England to the United States aboard a high-tech racing yacht says it will fly two crew across the Atlantic to bring the boat back, but that the carbon emissions from their flights will be compensated for.
A spokeswoman for Team Malizia said it’ll be necessary to fly the crew to the U.S. because the high-profile trip with the 16-year-old Swedish campaigner that left Plymouth on Wednesday was arranged at very short notice.