This is the gist i believe:

> In 2015, CERN’s LHCb found pentaquarks in their data with 9 sigma significance!!! This either proved that CERN can find whatever it wants in its data or it proved that the experiments which showed the pentaquark did not exist were wrong. I suspect that the former is true because I wonder what the expected probability of seeing the particle was in their application of Bayes’ theorem.

I 'm not sure that's an indictment of LHC itself or rather of the sloppy way with which science attribute importance to whatever is statistically significant. It's probably true that there is too much data and not enough good models.