The SH has armour fitted in its armour slot.
The FC7 doesn't.
Although there is no armour component in the game yet. all ships that have armour have a % damage reduction and higher HP in place to simulate the effects against other variants of the ship.
I dont why you are arguing this when its right there in the Xml.
Armor slot being used on the SH doesn't mean it can't share the same hull with another ship, it's just additional plating or a different material and the XML will be altered hugely to reflect the changes as we move on through development. As I said before we really shouldn't be focused on balance of ship v ship just now but more interested in physics and how things actually work such as landing, docking etc. Ship balance is something CIG should keep in mind but we need the basics to work and certainly in the latest patch that's yet again the area they're having problems with.