No, the poster is not implying that "'censorship' necessarily and only means 'removing obvious child pornography'". They're implying that removing child pornography is one form that censorship might take, and that entirely removing the ability to censor would remove the ability to censor child pornography. You might have valid objections to this, but it's not the same as what you've written.
As to the second point, either an organization has the manpower to defend itself from content that it is "accountable" for, or it will be unable to defend itself when necessary. It seems pretty clear to me that only organizations with decent resources would be able to moderate content in the "if you censor, you're accountable" regime.
As to the second point, either an organization has the manpower to defend itself from content that it is "accountable" for, or it will be unable to defend itself when necessary. It seems pretty clear to me that only organizations with decent resources would be able to moderate content in the "if you censor, you're accountable" regime.