"If you've ever heard the word "acid" in a song, it's probably a reference to the sound of the TB-303"
Ummmm, what? If you've heard the word "acid" in a song, it was definitely not a reference to the 303 and definitely the other use of "acid" like its use on the dancefloor. If you've heard someone describe a song as "acid", maybe it could be a reference to the 303.
That’s the same point the author was making. And it’s not just limited to descriptions. Record labels, track names, genre names, sometimes even DJ / artist names have taken their “acid” name from the distinctive sound of the TB-303.
Obviously it will depend on the era and scene too. Eg if people talk about acid in the 70s Prog Rock scene then it’s not going to be about a hardware synthesiser built a decade later. But if you’re talking about dance music, then “acid” refers to 303 more often than it does the drug.