Strict immigration policy has nothing to do with " to preserve your country as an ethnically based nation state". The first one is borderline fascist statement. The latter one is the opinion about state of politics.
The purpose of a strict immigration policy for many Europeans (and Koreans and Japanese etc.) is to preserve their countries as ethnically based nation states with a clear majority population. There is nothing fascist or racist about that goal. Its just that certain countries are based on having a shared culture, history, language etc.
I am not a big fan of Wilders, but calling him a Nazi, fascist etc. is simply wrong.