I wish people would stop propagating this myth. DDG hasn't been a good shot stopper for a very long time. Weirdly, last season he kind of looked to be getting back to his best, with a handful of really world class saves. But all that did was mask the underlying trend and fool us into thinking he was still a great shot stopper when he is no longer anything of the sort..
Here's FBRef data from PL goalkeepers last season. This is in order of PSxG-GA, which is the best available way to analyse how good a goalkeeper is at stopping shots (It's per 90 data, to make the comparison as fair as possible).
You will note that there were s
eventeen PL goalkeepers who did a better job at stopping shots last season than DDG.
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EDIT: Made an awful bollox of first version of that post. Hope to feck nobody quoted me.