A viewpoint being controversial isn't enough of a reason to dismiss or deplatform it. A viewpoint being completely unsupported (by more than other opinions), especially one that makes broad, unfalsifiable claims is worth dismissing or deplatforming.
Disinformation and "fake news" aren't legitimate viewpoints, even if some people think they are. If your view is provably false or if your view is directly damaging to others and unfalsifiable, it's not being suppressed for being controversial, it's being suppressed for being wrong and/or dangerous.