He'll probably say that the sailors who did this thought they were circumnavigating the continent, whereas they were actually just doing a circle around the Earth. Their navigational instruments were tampered with by conspiracy protectors, and made them go in a circle. And then he'll probably say that the boats somehow traveled faster than they would normally to make up for the extra distance traveled instead of how long it would be to circumnavigate Antarctica.
The FE theory is so fake/all its "believers" are trolls just so you know.