Yeah Pap, Rooks was pointing out that vehicle armor isn't Hardened Armor, because it has that extra effect.
Rooks was responding to Hobbes, who commented that it "Essentially turns a standard Armored Jacket into Hardened armor"
and Rooks was making the same correction you're complaining about.
Honestly, it's a common misspeak for people to call Vehicle armor (or barriers for that matter) "Hardened" because of the fact that if the modified damage doesn't exceed the modified Armor, none of it goes through and the attack is effectively ignored. A lot of people overlook that Hardened Armor does that plus the bonus hits. Barriers and Vehicles don't get those free hits.