Now the copyright_header.py script handles Objective-C source files *.mm:
src/qt/macdockiconhandler.mm
src/qt/macnotificationhandler.mm
src/qt/macos_appnap.mm
Also the only occurrence of Bitcoin Core Developers replaced with ubiquitous The Bitcoin Core developers.
EDITED: The reason to remove "Sam Rushing" is (on master):
$ git grep "Sam Rushing"
contrib/devtools/copyright_header.py: "Sam Rushing\n",