Although other standards use this word very frequently, "precondition" is not defined anywhere in WCAG2ICT, and may not be sufficiently understood by all our audiences. I think we had similar discussions in the past and we ended up removing "precondition" from some existing proposals, but this one did slip through.
I think we should substitute "precondition" with something that is self-explanatory and publish a future WCAG2ICT Note update. I think this would be an editorial change.