Okay, I just learned more about the sources the entry used. If anyone has Rogue One Ultimate Visual Guide, that would be great.
What I learned is that the Rogue One Ultimate Visual Guide referred to the Imperial I-class Star Destroyer Devastator and that she was the last of her class before the yards switched to the newer Imperial II-class. She received a lot of modifications. So these particular armaments can be taken with a grain of salt and possibly meant to be competitive with the Duece;
Dual heavy Turbolaser turrets, Dual heavy ion cannon turrets, Quad heavy turbolasers, Triple medium turbolasers, and Medium turbolasers.
As well for the 60 turbolaser batteries; whenever they're heavy because they're on Devastator or they're typical for Imperial I.
Once again, would like someone to chime in with Rogue One Ultimate Visual Guide info.
Very interesting indeed, hopefully someone does have the Visual guide to clarify. It would also make sense, since Scraif only housed a major database, it was already well manned by the wings of ties and two ISDIs. Sure it housed plans for major weapon systems but they probably have multiple banks (seeing how a DSII was created). They probably weren't expecting an attack from almost the entire Rebel Fleet.