The Titanic Creature is at the same physical power as a Senjutsu-Enhanced, Susno'o-clad Kurama avatar. (The blade was the last resort.) If Kaguya wished to destroy this thing, then she would have to resort to Eighty Gods Vacuum Attack, which is a chakra based attack. The attack works by collecting chakra in her fists and launching it at her target. If she used this around Momoshiki, then the chakra and attack would be absorbed and returned to her with a greater power than before. So this is an attack that can be absorbed as Momoshiki absorbs chakra.First Momo Lava Golem was destroyed with Susanoo sword RSM Kurama tanked that shit easily.
Eighty gods vacuum attack destroyed Sasuke PS with low diff so it can do the same with Lava golem or phoenix .
Eighty gods vacuum attack is taijutsu move and it can´t be absorbed so this alone negs Momoshiki.
Momoshiki died from giant Rasengan while JJ MAdara who is weaker than Kaguya tanked Lava RS which is way stronger that attack used to kill MOmoshiki.
Momoshiki wanted to eat shinju fruit to gain power that only Kaguya have,so this alone tells as he is weaker.
Momoshiki was a movie villain, every movie villain is beaten with a Rasengan regardless of power. Momoshiki was weaker in raw power, but he was and is the perfect counter to Kaguya. Because of that, he would prove an difficult foe for Kaguya. Furthermore, Momoshiki primarily wanted all chakra to achieve immortality and supernatural power (in that order). The only attack that Kaguya has that would remotely work on Momoshiki would be All-Killing Ash Bones, which Momoshiki can block or defend against in numerous ways.