Nothing to translate there really. Its just "HVAR have special barrels and ammunition to support the high ROF", then the bits he put there in english, but with long words.
Jack made one little error there though.
The HVAR fires 6/8 (normal/complex) Bullets in Burst Fire, and
9/12 in Full-Auto mode.
The 1,5x base damage of the Vindicator is pretty gruesome.
Supressive Fire with 15P -4AP and no need to care for Recoil compensation is absolutely brutal and something not even a superdodge-Adept wants to face.
To bad its 24F

Not sure about the viability of the HVAR. The Burst Fire mode is nice, but the one additional bullet is not THAT critical.
Compensating for the 8 Recoil of a normal Salvo in Full-Auto Mode seems also a bit difficult, due to the incompatibility of the HVAR for any barrel mods.
So no Gas-Vent, foregrip and electronic firing.
Cyberarm-Gyromount seems like the only viable option for Runners who aren't trolls or strength-maxer.
Damage is also a bit low for an Assault Rifle and the lack of AP doesn't help either.