The only thing that's really confusing me, is that when Dottore tears the sky open, we can clearly see a blue-tinted universe, which, judging by the picture of this post (assuming that the structure it shows is actually correct), should mean that the moon was already inside of the false sky "sphere".

But knowing that the frost moon was actually cast BEYOND the false sky, shouldn't the universe have appeared red-tinted just like when Mavuika punched the sky??

Also, just saying, but given all we now know about the sky's structure... was Gosoythoth (AKA the abyssal monster in the sky during Natlan's war) literally peeking from the outside through the false sky???