Saying "100% false" without explaining why is a baseless opinion. What does a square nose have to do with anything?
Make no mistake, opinions can be wrong.
If I were to say, "In my opinion, Blake Bortles is just as good a quarterback as Tom Brady." My opinion would be 100% false. Not because I don't believe it, but because it has been proven through competition that Blake Bortles is not as good a quarterback as Tom Brady.
Your statement, "IMO if you take a pre 08 and a post 08, add tubbies to both, they handle almost identical." has been proven through competition to be an incorrect assessment.
What the squarenose has to do with this, is that the SN and the 96-07 RN share a nearly identical bottom deck and handle very similarly.
If your statement were true, why would racers overwhelming choose to go with the 08+ style hull vs a 96-07 or even a SN hull that can be had for a 1/4 the price?
Bolt on any hull extension, tray extender, pump stuffer, rideplate, lead weight, front, rear, or mid sponson you want. The 96-07 will not handle like an 08+.
the 08+ is wide in the front and sweeps narrow in the rear with a smooth transition up to the bondline.
the 1990-2007 is a rectangular block with some chines thrown on it... Great for play riding, but cannot match the high speed turning abilities of the 08+