Ermm..... because, maybe, I've seen him with my own eyes, been there when he CREATED confusion in his own area with his defenders, under minimal pressure.
And since - when he was playing for his country.
You just can't 'rewrite' that sort of history.
Kuipers may have made mistakes too, but he's still at Brighton for good reason - and it's not "we can't afford etc", it's because he is good.
Maybe it's because he was on the transfer list from January through to May (when he finally apologised) and nobody made an offer for him.
The stats are very similar for goals conceded for both keepers.