

You are correct! And moreover, fragmentation was bad on HDDs because they are good at reading sequential data, so fragmentation limited performance by making reads more random. However, SSDs are the opposite and are more performant on random reads, so fragmentation actually benefits them! (some of the time)
ChatGPT is just fancy autocomplete, so it probably got the notation from somewhere else; it’s not really capable of inventing new stuff on its own (unless it hallucinates). It would be interesting to ask it where it saw that notation in the past if you didn’t support it before, but in a way, you could say it’s a standard form of notation (from a different service).