E. caeruleus and E. axillaris have been split, as you might have guessed.
HK gets E. caeruleus as seen from "Birds of HK and South China", now properly named "Black-winged Kite" but it is named "Black-shouldered Kite" in older editions of the book, i.e. those published before the split.
The bird NOW known as "Black-shouldered Kite" is an Australian endemic.