Holy shit, they scaled DIO to Star Platinum because of the road roller scene. They ignored that some panels after that, Star Platinum literally broke DIO's legs with a kick and DUSTED The World with a punch.
Literally every interaction between Star Platinum and DIO is a stomp. How the **** you scale DIO to Star Platinum, when he literally
cave in DIO's skull,
exploded the back of his head and chest with punches,
made a hole in The World's body,
broke the hand of a further strengthened The World, and most important,
dusting The World with a punch.
Hell, the road roller scene was even corrected in the anime with both DIO and The World overpowering Star Platinum, and DIO himself after this scene compliments the strength of his Stand, the famous "STANDO POWAH" meme, it wouldn't make any sense to compliment his Stand's strength when he didn't use it to defeat Star Platinum. Besides that, even the guide states that DIO and The World overpowered Star Platinum in the road roller scene.
They did everything wrong, holy shit.