TL;DR: It's a commit where the word "dummy" (occurring in dozens of places) was replaced by "phony".
Looking up the etymology of "dummy":
> 1590s, "mute person," from dumb (adj.) + -y. Extended by 1845 to "figure representing a person," hence "counterfeit object, something that imitates a reality for mechanical purposes."
Looking up the etymology of "dummy":
> 1590s, "mute person," from dumb (adj.) + -y. Extended by 1845 to "figure representing a person," hence "counterfeit object, something that imitates a reality for mechanical purposes."