I owned the previous rack, Dr110, for like probably 15 years. It was black, but still aluminium. Because of gigging, the black became all scratched up, but never came off or anything.
You wont hurt the rack unless you abuse it. The more you move your kit around, the more likely it will get scratched, dinged, whatever. That rack is tough. I'd be willing to bet you could throw it off a building and set it up immediately afterwards and it will work no problems.
And even if the coating came completely off, its aluminium, it doesn't rust. It does corrode, but corrosion on aluminium is actually a hardening of the surface and that protects the aluminium from further corrosion.