That's a bit different than saying that Fascism "has no grounding in economic theory nor in fostering discussions on how to allocate scarce resources".
Both Marxism and Fascism *can* provide valid discussions about economics and how to "allocate scarce resources".
So your argument that we can dismiss Fascism because it has no relation to economy is simply wrong.
"Historians and other scholars disagree on the question of whether a specifically fascist type of economic policy can be said to exist."
"scholars argue that fascists had no economic ideology, but they did follow popular opinion"
If the experts cannot agree if a fascist type of economic policy can be said to exist how can you be so sure that one does?