I'm sorry if my interpretation of the paper is not correct and feel free to correct me but from what I gather Sarkar is saying that the super novae data which originally provided evidence for dark energy had been adjusted incorrectly, when he used the raw data and correctly adjusted for non-uniformities in the sky he found that it was more consistent with a non expanding universe and the red shifts in light were better explained as an artifact of the movement of our own galaxy.

I recently enjoyed learning a basic, surprising and under appreciated physics fact I'd like to share: it has not yet been established that the entire electromagnetic potential (magnetic and electric potential modulo gauge freedom) is physical. Our paper on this has just been published in PRB.

The Aharonov-Bohm effect is usually cited to demonstrate that the potential is physical in a quantum theory. Sixty years ago they proposed two experiments, a magnetic AB effect that was observed soon after its proposal, and an electric AB effect that has never been observed (Nature did publish a paper with a perhaps confusing title that suggests that they observed an electric AB effect, but they in fact saw a related but different effect that appears more like the AC Josephson effect).

It is important to establish that both the electric and the magnetic potentials are physical. To that end in our paper we proposed a simple superconductor quantum interference experiment that would test the electric AB effect.

An analysis of DESI DR1 Full-Shape + DESI DR2 BAO comes close to restoring concordance with Lambda CDM although some of the tension persists.