Incorrect. In 2012, they previously did not stonewall inspections in 2005. 2012 is previous to 2015, though, so that much is correct.
No, in 2012 they previously allowed inspections in 2005, and stonewalled absolutely everyone presently in 2012.
That's exactly what the assertion was, since Hotair didn't qualify the statement in any way.
Correct.
In the context of "who have you previously driven for?" your first answer would not be 100% incorrect, as important and pertinent information is missing. It's a lie by omission. In the context of IAEA inspections of Parchin, saying, "Doing this allows Iran to at least attempt to defuse some of the criticism of the deal since they had previously stonewalled absolutely everyone in terms of access to the site," is incorrect and misleading, at the very least, and at the most, a blatant lie by omission.