that would include AC's and LAC's as well and Cpl and above, as they all have not been commissioned.
That is the point. All ranks not holding a commission.
Previously you had SNCOs, W/Os and Other Ranks. NCR is a catch all and rather simpler to write. Also I recall some statement that 'Other Ranks' was a bit negative, or insulting or something so was done away with.
We still use the term Junior Ranks for AC-CPL where appropriate.