I know it’s been a while since this thread was started, but I have something to add. I am actually the author of that Reddit post you linked. (I’m glad you found it interesting.) Since then, we've come a long way— and actually have a definitive answer. Through datamining, there is the extremely helpful BotW Object Map. It’s mostly used for the locations of ...
We see multiple version of the island map in various episodes. They're all largely similar to the high altitude map shown in Splashdown.
Map of the island from Forward March.
Map of the island from Man With a Net.
Map of the island from Hi-Fi Gilligan