I don't have a good answer; maybe the key is to just ask folks "what do you mean when you say ecofascist" and go from there.
But it does seem to me that there's a vast discrepancy between what antifascist scholars, and opinion writers on mainstream internet sites, mean when using that word.
And in the latter case it seems to me to be supporting the idea that murderous nazis have a genuine motivation, when I know it's literally just a rhetorical device to justify murder and eliminationism.