Can you prove that kaguyas dimensions (the Naruto shippuden manga) can you prove her dimensions are timespaces/universal sized dimensions?
There is no concrete evidence in the Naruto Shippuden manga that explicitly states Kaguya's dimensions are time-space or universal in size. Kaguya's dimensions, such as the Ice, Heat, and Acid dimensions, are simply alternate worlds within the Naruto universe that she created using her unique abilities.
While Kaguya does possess immense power and control over space-time in the series, there is no direct confirmation that her dimensions exist on a universal scale or that they contain time-space properties. As such, it is not possible to definitively prove that Kaguya's dimensions are time-space/universal sized dimensions based solely on the information provided in the manga.