I have not encountered any fascistic aspects to groyper movements. Such as forcible suppression of opposition, or desire for a totalitarian state.
They just seem to want to voice their opinions and views equally and let the country decide. They agree with the likes of the Dali Lama that "Europe belongs to the Europeans", and that all peoples have a right to their homelands. I'm not too familiar with USA Groypers, only English/British Ethno-nationalists.

If anything the mainstream media is fascistic with its forcible suppression of dissenting voices, such as towards the groypers.