Christians are a protected minority in Iran, they're allowed to do whatever they want as long as they're not heavily trying to convert Muslims.
And the acceptance of Christians is increased when it's tied to their ethnicity.
For example Armenians (Assyrians? Someothers) are tolerated completely, but Protestants have some suspicion because they come from the outside, go out on the street and try to convert and are viewed as "american influence" like the Bahaí.
Orthodoxchristianity.net is probably not blocked because the ethnic Armenians, as part of the toleration kit.