xG is far too noisy of a stat to take seriously for evaluating goalie talent. There are too many results that just make no sense. Aggregating GSAx/60 for the past 3 seasons (Min 1000TOI), Curtis McElhinney ranks 4th, Casey Desmith ranks 7th, and Laurent Brossoit ranks 11th while Carter Hart ranks 52nd, and Carey Price ranks 58th. The noise comes from the fact the margins are so slim. The 10th best goalie on your list is saving 1 more goal per 20 games than an average one. There are five goalies on the list who are within 1/100th of a goal away from average, or less than one goal per entire season if they were to start all 82 games. Trying to establish a ranked list on that thin of a margin is going to lead to awfully noisy results that don't stand up to scrutiny.
The table you posted above bears it out with the Lundqvist example, where by GSAx/60, Georgiev ranks below Lundqvist despite outplaying him (for the second straight year) behind the same defense, taking the starting job in February, and remaining a much more prominent part of the goalie rotation than Henrik once Shesterkin was called up.
At this point, the best option is to continue to wield numerous hockey stats together to pain a fuller picture, rather than falling for any one measurement.