I suggest that you read the last paragraph of the enclosed article on the STV news website.
https://news.stv.tv/sport/dundee-to-...sport-scotland
In it Nelmsy states that it is only planning permission in principle and they can get the finer details sorted out when we go to full planning (permission).
Assuming that this statement is correct then full planning permission for the new stadium development site at Campy Nou is going to take a while and we will be playing in Dens Park for more than the next two years Nelmsy stated in the enclosed article.