If you can't see that the number of goals a keeper concedes is closely correlated to the strength of the defence then there will likely be no convincing you. A much more statistically significant metric for a goalkeepers performance over the golden glove is save percentage - in which he finished 6th in the championship.
Although as a stat that can also be misleading as if the defence is strong and they force the opposition into long shots, the xG per shot would be significantly lower. Last season we had an xG against of 1.4 compared to our 0.96 actual conceded meaning a ~+20% stronger performance than would be expected. This places him... 6th overall in the championship last season also.
In summary, golden glove is nice and all but it is seldom awarded to the best keeper in the league.
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