Uh, basically, Bowser had to have created the worlds in the Castle because he has his own world there, which would make no sense to exist prior to the events of the game. This supports the Power Stars creating Worlds which corroborates the official translation. The timeframe can be short enough for the feat to be used as well.
The opposite side says that these paintings worlds always existed prior to the game because they have their own histories with NPCs who are allied with you, and that some translations only say Bowser would make a monster army to rule the lands with the Power Stars.
However, creating a world with histories can be done via creating their space-time as well, and people who only want to use the monster country/land translation should stick with that and not acknowledge the fact he does create a world, as acknowledging he does create one goes against their entire argument in the first place and is nowhere said with the translations they use. To acknowledge creation of any world is to acknowledge and support the official translation in the English version that says he can create worlds.
The only wrench in this is Throwback Galaxy which is basically a remodeled Whomp's Fortress. But people could argue this shows that these are places in the universe that the paintings take you to and not worlds created by Bowser.
But given the vague nature of 64 and it's multiple translations I suppose this could be the exception to the rule where we allow secondary sources to fully judge a rating. I'll try and find as many as I can.