Plus, this sentence in the original post I replied to really struck me as absurd: "Content-neutral time, place, and manner restrictions aren't censorship".
Let's imagine a country bans the distribution of all writings by authors in another country/region disregard of the content. It would not be censorship according to the original post.
The fact that a ban encompasses a wide variety of content could mean simply that it is difficult/undesirable to limit the scope of the ban, but the censorship always originates from the content.
You are misunderstanding time/place/manner restrictions. The rule must apply equally to all speakers regardless of topic, opinion, or political stance. If you banned "the distribution of all writings by authors in another country/region" you aren't applying the restriction equally.