IDGAF if it feeds into the narrative. It also shuts down a recruitment pipeline. It reduces their reach. It makes the next generation less likely to continue the ideology. De-platforming is a powerful tool that should be reserved for only the most crucial fights, but the fight against Nazi is one of those fights.
The Nazis were already full-blown conspiracy theorists. EVERYTHING is spun to feed into their narrative. That ship has sailed.
A platform operator needs to AT MINIMUM demonetize the content and censure it, and is likely only being responsible if they ban it outright. If you aren't prepared to wade into the fraught, complex world of content moderation, don't run a content platform.