To be fair, the group that originally coined the name Fascist was a Nationalist Italian political movement. So he's not entirely wrong.
If I'm honest I do not feel confident I could properly define Fascism as a political movement/philosophy either. That is not just an offhand comment; as "Fascist" has become the go-to slur for TRAs I have been looking for a good clear explanation of Facism to counter it.
This is not to imply that since I don't have a definitive definition of Fascism I might unknowingly be one. Obviously, even just a basic understanding is enough to know I'm not.
But I don't fully understand what makes an ultra-nationalist and social, racial, sexual and gender (in the purely social sense) diversity intolerant regime specifically Fascist when there have been (and still are) states that embody the same values but are not called Fascist, for example Soviet Russia. And it's not simply economic left vs right because the Facists weren't hard core anti state capitalists - in Nazi Germany the state provided a lot of support, cradle to grave for the right people, all part of building their strong state. (National.Socialists....)
So my working understanding of Fascist is something like "Ultra-nationalist, traditional social roles enforced by the state through social as well as property laws, Capitalism but with strong state sponsorship and protectionism, no elections or elections between tightly limited options only".
Derail I realise, but if anyone has good, neutral references I'd welcome them.