I'm not sure what you mean? The Nazi party was a fascist organisation...among other things. Mussolini's party was fascist as well. I dont think it was possible to be a Nazi supporter and not a proponent of a Fascist agenda in the 1930's/40's but todays Nazi apologists are often primarily interested in the Nazi's racist and antisematic agenda. For many people Nazi apologism is strongly and perhaps primarily linked with Holocaust denial.
The word Fascism may today primarily conjure images of Hitler and the Third Reich, but in the thirties it was strongly tied with Italy as well.
Your parent comment sounded like you said that Nazis are not fascist. Fascism is a broad historical tradition, and of course contains Italy, Nazis, and a whole host of other terrible stuff. I should know: fascists are my enemies, as they're directly ideologically opposed, and there's a long history there, as well as personal, real-world political work.
Anyway, I think the fine line of disagreement here is that I personally see "Nazi apologist" as someone who is an apologist for _all_ of National Socialism, not just certain policies. You may be correct that today, people could consider anyone who's denying the holocaust to be a "Nazi apologist."
The word Fascism may today primarily conjure images of Hitler and the Third Reich, but in the thirties it was strongly tied with Italy as well.