We don't really understand any of the "four forces" at a fundamental level.
“propose that the universe is filled with a quantum fluid made up of gravitons”
Step 1: prove gravitons exist.
We still have a serious lack of understanding about gravity and how it relates to anything else.
Lacking that, kinda pointless to make authoritative & disruptive proclamations about the origin of the universe.
It doesn’t claim to be authoritative.
Speculative science is important, giving new ideas to test.
Lots of science was advanced by testing unpopular theories and good or even wild guesses
Indeed, the one force that holds the universe together, that makes everything possible, and all we really know about it is the effect we witness. I can take two golf balls, place them 40,000 miles apart, and somehow they interact with each other. If no particles pass back an forth, how is that possible. I don't think they have even determined what the speed of gravity is.
We don't really understand any of the "four forces" at a fundamental level.