IMHO, a “chiptune” is music for an FM synthesis chip, like on the NES, the SID chip in Commodore 64, or the AdLib sound card for PC. A “mod” or “tracker music” is music made for a range of platforms in a rather narrow time-band, that could play digital samples, but could not reasonably store entire songs recorded digitally, like the Amiga, Atari ST, or early PC’s like 386s or 486s.

Those are SID etc. tunes. Not chiptunes.