There would be an easy biblical explanation that could solve this, using this scripture.
not being shifted away from the hope of that good news which you heard, and which was preached in all creation that is under heaven. Of this good news I Paul became a minister.”
Col 1:23
of course Paul can only refer to the “world” as is known at the time.
He wouldn’t have known about North or South America for example. Same would be true of Noah.