Pingvin is not really a Nazi, he's just an ignorant buffoon.
There are plenty of ignorant buffoons who don't want to mine the Greek-Turk border in order to stop immigration and who don't facepalm at posts saying diversity is a good thing.
"Nazi" is, of course, a hyperbole, but not as far off as it usually is when the word is generally used on the internets.
Being against immigration doesn't make you a Nazi/fascist/racist etc. Mining the border is a bit extreme, but not against international law. If a sovereign nation wants to do it, they are allowed to and supporting it is not anti-democratic in any (meaningful) way.
Pingvin sometimes says extreme things and especially his choice of parties he supports in other countries is a bit disturbing, but I wouldn't call him a genuine fascist let alone a Nazi.