that is... pretty clearly not true. there are things foreshadowed hundreds of chapters in advance, and the arcs post-timeskip all have pretty obvious parallels to pre-timeskip arcs.
Even from the first arcs he was making shit up. This is the strongest person in east blue
Oh no THIS is the strongest person in east blue!
can you point out specific example of this that aren't just the characters bragging?
Everyone was touting about how Don Krieg was the strongest in east blue, and then they did the same thing for Arlong immediately after. ---