This is a common mistake. The road will be 3.5 kilometres (more than 2 miles) away from Newgrange and will not be audible or visible from Newgrange. It is not 500 metres away. There is an exclusion zone or buffer zone around the Bru Na Boinne site which Unesco put in place to protect the core area. The proposed road is outside that buffer zone. The road is 3.5 kilometres in length and is necessary to prevent serious accidents in nearby Slane village by bypassing Slane.
Of the 44 archaeological sites within 500 metres of the roadway, 34 will be unaffected. Of the remaining 10, 2 will be impacted positively (such as Ledwidge cottage which will be untouched but will have improved access), three may or may not contain items of archaeological interest, and the remainder are minor archaeological sites such as a gate and a pillbox.
This road is vital to protect lives. The route is regarded by An Taisce as the best possible route. It is unfortunate that there is such misinformation about it.
The RTE news link which you have posted has been recognised as being erroneous.
Something is not right. This message is just to keep things from messing up down the road