General jargon like foobar is not that far off in meaning from "unfinished software". I think it's possible there's not really a contradiction between the different sources. The "unfinished software" meaning in the NYT article might have just been an example of one possible use of a more general nonsense word.
Don’t want to be that guy but brace yourself for part 2… if the first one disappointed you in some places, the 2nd is going to beat you to a pulp. And I won’t even start on the third. I’m the kind of person who prefers not to finish a game than to read hints or walkthroughs, and parts 2 and 3 have been sitting on my unfinished stack for literally decades. :(