[kurumo]

There is an IM in Boston who routinely gives people, mostly without regard for their rating, 30 seconds to 5 minutes odds with no increment. I have seen him win these controls against other masters. So comparatively it is not too surprising that Carlsen would be willing to accept these odds against an unrated amateur. Chess with this kind of time controls is basically a different game, which requires emphasis on different skills than do standard time controls.