Old galaxies in a young universe?

alternative_right writes: The fact that some of these galaxies might be older than the universe within some significant confidence level is even more challenging.

The most extreme case is for the galaxy JADES-1050323 with redshift 6.9, which has, according to my calculation, an age incompatible to be younger than the age of the universe (800 Myr) within 4.7-sigma (that is, a probability that this happens by chance as statistical fluctuation of one in one million).

If this result is confirmed, it would invalidate the standard Lambda-CDM cosmological model. Certainly, such an extraordinary change of paradigm would require further corroboration and other stronger evidence.