It is simply a TN-s system period as you have a suppliers earth as your primary earth. The Earth rod is purely that and is not and should not be translated as a TT system. The earth rod is there as a belt and braces job and to provide and give a better earth path only. The only issue you may have is a PFC as with the very low resitance to earth you will possibly get a very high Earth Fault current exceeding the Ka of your protective device/devices. Your short circuit fault current will be considerably lower. In Compex installation the better the earthing arrangement - and in design additional earth rods are by design placed in the installation for greater protection. Why remove it as its offering a good additional earth path - doing its job.