another great thread - thanks Gary.
so the Oxford group (your previous dark energy thread) are OK with the 1a expansion data (I guess), but think that the acceleration analysis was faulty. The Korean group (this thread) thinks that 4 different studies show that the standard 1a candles are evolving, so the expansion data itself may be faulty.
interesting times. thanks and cheers Ray
FWIW, this summary is a bit old, but it seems to give a glimpse into just how difficult studies can be at the cutting edge in this field.
https://physicsworld.com/a/the-dark-energy-deniers/