Is your certifier insane? The majority of places don't have those things (except the driveway, and some don't even have that) when they move in. We did our landscaping 6 months after and we had to wait a whole year befor the fence went up (as we had to wait for neighbour to finish their landscaping
I'm quite sure I saw that previously, but now can't find the dang paperwork
Yes, it supposed to be timber slats - it's in the estate guide lines and also if I recall, in the council stuff too. Although, so many other things get through that aren't supposed to, I doubt a colorbond fence would cause an issue unless your neighbour objects.