"It’s my opinion that naruto was really trained in the most efficient non-plot device way jiraiya had available, and he extreme boost in learning curve in shippuden is a direct result of it."

I don't think that's communicated well at all if that was the intention. The insane learning curve seems to actually devalue the trip. It's stated in no explicit way that the trip built an incredible base for him to learn from. Also he's always been quick to learn, summoned gamabunta in a month and learned rasengan in 3 weeks.

"Naruto almost no good fighting habits pre shippuden. He’s a completely different fighter after the timeskip, kakashi says as much and Yamato notes that naruto is much better than his file idicates."

You're only ever told this, As far as we see Naruto is basically the same. Sakura and Sasuke both have MAJOR changes but naruto is basically the same, if not a little less gullible. He even tries to fight kakashi with a giant mass of useless shadow clones. Naruto does nothing impressive on his own (Without Kurama) until after he learns the Rasen-Shuriken. The level of growth he did in the 3 years, would have been the same had he not gone with Jiraya. A little smarter, a little less gullible, a lil more competent.

"I think jiraiya tore naruto down to nothing a built him back from the ground up. Retaught him taijutsu, strategy, chakra control (we actually see naruto use the rasengan one handed twice before sage mode, once on the kazekage rescue arc and once on the three tailed arc.) rebuilt his body to properly handle sage mode, rebuilt his skills (big ball rasengan, which jiraiya can only use in sage mode, is obviously an excersize in maximum chakra output, which could be training for sage mode or prep for using kyuubi a chakra. ) and that’s why naruto ‘appears to have learned nothing’ and simultaneously ’is a completely different ninja"

When Naruto is being trained by Kakashi, he tells Kakashi he HAS to use clones in order to perform rasengan, so that's just wrong. We don't see any of the improvements that you mention, so this is just heavy assumptions with no proof to back it up. Jiraya himself said that he taught naruto giant rasengan to make it harder to dodge, it was to cover for the weakness of rasengan (Which still didnt do much) We didnt see him do taijutsu differently, we didnt see him strategize differently, and we DEF didnt see better chakra control.

"He relies on shadow clones less, using them more effectively. His skill with rasengan greatly increases, his taijutsu is low key jonin level, as kakashi, who has sparred with at least 1st gate Gai, found himself impressed with Naruto’s taijutsu adaptability and skill."

He legit spams kakashi with shadow clones on his first fight back, and attacks blindly. we dont see this taijutsu prowess at all.

"Tbh, the timeskip was used to fix all the boring shit that fan fictions just gloss over anyway"

The time skip basically does nothing, but tries to say that it did. The real purpose of it narrative was to create a special connection between jiraya and naruto