You missed it by just a couple of months or so :)

pam_modules-159.50.4/modules/pam_tid/pam_tid.c appeared in macOS 10.12.4 https://opensource.apple.com/release/macos-10124.html

And macOS 10.12.4 was posted on Mar 27, 2017, according to https://support.apple.com/kb/DL1911