He holds copyright, but to my knowledge he hasn't been an active contributor for a very long time.

(At least I remember reading a discussion on BZFlag licensing a decade ago, when his inactivity was already noted. Looking at the commit log, he made 9 commits since 2011 and they mostly concern licensing.)

Yes definitely, hand translated into hexadecimal and then typed in via code monitors, or if getting fancy DATA blocks, preceded by a mini loader and jump to execution entry code. /s