If we accept that Enel's cover story is canon and not a wacky joke sendoff, we have to accept that he flew to the moon using propellers. Just sayin.
Dude this is One Piece. Anything that happens in a cover story is canon. If you are only now coming to terms with the wackiness then you need to do a reread with an open mind.
In One Piece the following can happen and it's all serious business even if played for gags.
1- Not only can you get to the moon with propellers you can get to and from there with every day helium balloons. Serious business.
2- Entire Islands float in the sky with balloons. Serious business.
3- If brute strength isn't enough to break iron chains then the main characters rubber teeth are powerful enough to eat through them. Serious business.
4- You can survive standing on stilts for years eating just apples and never once come down.
Serious business.
5- Blowing into the thumb or muscles of a rubber man causes the limb to inflate like classic cartoons. Serious business.
6- Love can hurt a fruit user just as much as Haki. Serious business.
7- A man replaced much of his organs with a refrigerator that runs most efficiently on Cola. Oda explains "because cola is good!" Serious business.
I think you might have been the only one who didn't take Eneru's story seriously. I mean if you look at the ancient pictures you can discover so much. It explains why they left the moon, how they left the moon, why there are multiple types of wings, why the Shandora civilization had wings before they went to the sky, and with Luffy winking at the audience with wings we were given a massive hint about D's, the ancient kingdom and its allies.
This is One Piece, where the absolutely absurd is still serious business.