First of all Singh's paper shows only that the very complex Lie group of SO(4) has many of the expected properties of gravitons, but that is very far from proving that gravity is an emergent classical phenomenon. The trivial U(1) group is just one dimension of Singh's 8D octanion graviton (see attachment).
The important question to ask is how can any measurement ever show a reality of 8 dimensions when we only really have 4D space and time? My opinion is that the math is interesting, but really not that useful for describing the rather simple reality of matter, action, and quantum phase. This is after all just a simple SO(3) Lie group that is noncommutative, but also includes gravity as anticommutative. Science assumes gravity is commutative since spin = 2 gravitons are not part of gravity relativity. Of course, spin = 2 gravitons are actually anticommutative, but that is a different story.
Anticommutative is also noncommutative, but in action and matter, not space and time. This means that quantum gravity uncertainties manifest themselves as uncertainties in matter and action, not location and momentum as in quantum charge.
Graviton noise is the key to understanding physical reality and is something that Science can and does measure. However, in the ocean of electromagnetic noise on earth, gravity noise is very difficult to measure as shown by LIGO. Even at Lagrange 2, LISA had a very hard time measuring gravity noise, but of course it was not meant to measure gravity noise. The next LISA will actually measure gravity noise, and so that will be exciting.
The cosmic microwave background is also an example of gravity noise along with electromagnetic noise, but the gravity noise is ambiguous at large angles of correlation due to the limits of electromagnetic noise in the measurement. Future missions far away from earth will push the noise limits of that CMB and that will be exciting as well...Attachment #1: 2020singhLieGroup.JPG