I'm not too sure about short keepers either but 189 cm is a decent height for a keeper.
Pepe Reina is 188 cm tall.
189 cm in feet is 6ft 2in
Karius would be one of the shortest keepers in the premiership.
Only Schmeichel and Speroni are shorter.
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6ft 2.4 to be precise. So he's around the same height as Adrian, Vorm, his almost-namesake Lloris, Fabianski etc - very normal GK height, not fair to say he's "short," just not one of the super-tall ones.