Is finite, occupied 'space ' truly expanding.
.....‘The previous and well-accepted measurements were, in fact, fine and our current understanding of the fate of the Universe remains robust. Thankfully we have averted this crisis, but the mystery about why the Universe is still accelerating remains. By proving our measurements are correct, we can get back to trying to understand what dark energy actually is, rather than wondering if it exists at all.’..
I.e what is this occupied space stuff called ' space ' that our instruments determine to exist causing us to see celestial objects retreating away from each other in all directions --for the most part---?
Maybe it is just sine-wave of EMRadiation is getting longer, and it looses energy in that process. The one way we observe or account for as seeming violation of 1st law of conservation. Lower frequency equal less energetic photon.
Tho to be clear, that in long run as in Entropic Heat Death of Finite Universe, the overall value of EMRadiation is still accounted for an not lost.
https://www.physics.ox.ac.uk/news/new-study-confirms-universes-expansion-still-accelerating