I have doubts. Slop just means low quality or effort, or even waste. And it has a lot of meanings outside of software reinforcing that meaning. Not the least sloppy. Slop even is a dish. It was always a derogatory term for all sorts of things.
In some languages they seem to have used slop as a term for ai slop as a loan word. Who knows how that term will evolve in those languages.
Speaking of words, it's been a while since I heard the term shovelware. Something I would currently call slop.