“Explains only about 4% of the matter and energy in the universe”
The other 96% is creamed corn.
Here’s an article related to this interesting subject.
https://backreaction.blogspot.com/2021/09/the-physics-anomaly-no-one-talks-about.html
There seems to be some information missing in this article. The photon collisions have enough energy to produce muons but muons have charges so the collision has to produce a muon (negative) and anti-muon (positive) pair to maintain charge conservation.
Because of this charge the muons would have different trajectories in the vicinity of a positively charged ion nucleus. The article did not explain how this angular deviation was accounted for to calculate the residual angular deviation that was reported as novel. This is always a hazard when scientific papers are simplified to make them readable to a general audience.
Not sure I would use the term “collision” for photons, as the superposition principle still applies.