It was GXE, which is different than Glicko, but has a similar name.
https://pokemonshowdown.com/pages/ladderhelp#:~:text=GXE%20(Glicko%20X%2DAct%20Estimate,has%20rating%20and%20deviation%20values.
He would have been closer to 30 the time as well so it makes sense.