This topic has nothing to do with the Biblical Noachian Flood.
Yes, correct. The question to me was whether the earth (land mass, I surmise, not the extant diameter) may have been smaller before the rumored Flood. What with pre- or semi-sentient beings running amok hither and yon I suspect it may have been, as the article indicates.
I know things change radically with relatively minor events, such as the Missouri River flooding I have seen in my brief lifetime. High spots go away, scour holes appear 70’ deep where you once could drive. Routes of travel change dramatically....places you could go are inaccessible suddenly.
More cataclysmic events and longer cycles would only have more dramatic effects, IMHO.