your questions regarding the game rules (improving the interpretation).

by flanking and attacking from the left, he will scout and gather information on the left side of the treasure (there is no darkness there now – but there was before the scouting, which turned out to be useless information; it could have been the edge of the wings or a Guard/Outpost). Situations vary, and it could also have been Hota with a hero on a scouting mission with 3 artifacts on her.

The rules allow the player to go to the left along the sand to bypass the shifted Guard. This is the shortest path to bypass the shifted Guard, avoiding the Guard made of golden dragons. And if, thanks to the wings, he flies in from the right side along the treasure – this is a violation, because the player will receive information before bypassing the Guard, according to the rules. Why you don't consider obtaining information as an action at all, I don't understand. Why saving movement points by ignoring the rules for bypassing the Guard is not considered a violation is also unclear.

"He can go onto the sand and pass by the shifted dragons to bypass the efreets."
In fact, this is a comment on a specific case, and the comment directly states that he can pass by the shifted dragons, and not fly through the treasure.