https://flatearth.ws/t/miroslaw-hermaszewski It's a joke at the end of the interview. Earlier in the interview he says earth is sphere.
The entire interview is done through 2 way translation, making closed captioning auto translation basically impossible. I figured out that the clip in question is at the very end of the interview. They're smiling and joking, it's obvious. The entire interview is about space. Someday I'll translate it.