I don't like it. No offense and I can't quite put my finger on why, but it doesn't seem very effective. I will try my best to elaborate.
The Havocs behind the Quad Gun
Since they all have to fire at the same target, you've basically got 6 Autocannons pointed at one thing. This to me seems like too many points targeted at one thing. Also known as overkill. Granted anything AV11 and most infantry will surely die it just seems like a lot. But I guess it is only 215 points. So maybe it's not so bad. Agh your list is weird!
People are all crazy about these things because someone said you can get a million wounds for only a few points. I personally don't like them. They have no gun and no armor save (unless you roll it) and they aren't really that effective in combat. Have you used them before? Can they actually clear units off objectives? If they can then I am wrong, but I don't think they're that special.
The Lord and his Zombies
This setup seems like a waste of your Lord. He's up there in points to just be sitting around with some zombies on an objective. If these guys are sitting back that means only Typhus and the Spawn are rushing forward. Maybe the spawn are tough but when they're the only thing to shoot at they won't last long.
The other squad of zombies
Why do the havocs need a buffer? They've already got the Aegis Defense line. There's really not that much of a point to keep another squad in the back. Send them foward to give the enemy more things to shoot at.
Typhus and Oblits
You've got a lot of points tied up in 4 models. Granted they are tough as nails, they really have to kill a lot to get their points back. I expect they will kill the first thing they target at range or whatever they can charge but then what? They can only walk after that and can't run because of the Oblits Slow and Purposeful, so all they will really be doing is shooting. So if all they're doing is shooting, why do you need Typhus?
Those are just some thoughts, if this list works for you be sure to let me know so I can adapt my tactics. Otherwise, there's not much I can suggest to change because honestly I would scrap the whole thing
Again, no offense.