I agree that this isn't a faction of it. Some of the factions of ideologies seem to be done biasedly, but there will be a bias, and I understand AV.
At least, it should be technically neo-nazism, and also none of the candidates on the list are in my opinion neo-nazist fortunately, although some flirt with it. Fascism is something completely different as well. I don't think OP understands fascism, but America First seems absolutely not fascist. What you can say however is that it is a white-supremacy party at worst and there is a faction of white supremacists.