It's an interesting post. First hand, I disregarded it, but after some reading, I admit there are some valid points in it. But my main concern is the following:
In our typical army, having dissies, CC reavers and grots, we already have a good threat for low AV vehicles. We don't really need additionnal weapon that damage those. As I see it, we need units to go against 1 specific kind of ennemy, while being OK against another. Against TEC, we have our dissies, that can still hurt low AV vehicles. Against small units, we have CC reavers, that are even better against low AV vehicle. Against blob, we have grots and again, they are good against low AV vehicle. Against High toughness units, we poison them to death.
I dont really see where shredder complement this army, or what they should replace.