In the 90s at least, chip music for the SID was mostly called "SID tunes".

People didn't care about authenticity of real chips vs. chip-style tracker music until fast Internet and large disks became common. People stopped caring about small file sizes, and started making chip-style music using DAWs and releasing it as MP3s. There was backlash against this, and people began to think that only music made with hardware chips was authentic.

I believe tracker chiptunes were collateral damage in the rejection of MP3 chip-style music, because there's no way to to clearly define if tracker chiptunes are real chiptunes or not. Lots of tracker chiptunes use short percussion samples in addition to the looped single-cycle waveforms. When there was a culture of keeping file sizes small, this was accepted without question. When large file sizes forced people to start thinking about what counted as real chiptunes, this element of subjectivity became a problem. How long a sample is too long? With music for sound chips it's easy to test if it works on the real hardware. There's no equivalent test for tracker chiptunes. It's easiest to rename tracker chiptunes to "chip style", and use "chiptune" to mean hardware chips only.