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

Essentially, this doesn't change anything. The player stands on their own base, uses flight, and clicks to attack the Guardian, meaning their first action is to attack the Guardian (they cannot cancel this option and stop halfway). It's not the player's fault that they had to fly through the treasure. They could have flown from point 1 (Scorpio's drawing) and flown behind the Monarchs (with an attack, of course). The point is the same.

In this case, the first action is not attacking the Guardian, but visiting the treasure. Whether it's by flight or on foot is no longer important.

The player stands on their own base, uses flight, and clicks to attack the Guardian, meaning their first action is to attack the Guardian (they cannot cancel this option and stop halfway)...- So, if the option cannot be canceled, does this not affect the rules?

It's not the player's fault that they had to fly through the treasure...- well, that's not an explanation at all, just like (they cannot cancel this option and stop halfway).

They could have flown from point 1 (Scorpio's drawing) and flown behind the Monarchs (with an attack, of course). The point is the same...- the point is not the same; here, it's about scouting and reducing movement point costs.

If they had flown through their own mountain and attacked from the side of the Monarchs, there would be no questions.