Brother, outstanding work, you're too modest, it looks like you got Your Plan, a Poxwalker horde supported by Typhus and a Fugaris Helmed DP, then a Winged DP to strike at things in your opponent's backline. Looks good, just 2 minor suggestions and they're not that necessary.
1st, I personally prefer the Revoltingly Resilient (Disgutinglier Resilient save) Warlord Trait on my Suppurating Plate Daemon Prince more than the Toughness one. There's also the Warlord Trait, that reduces incoming damage by 1, Rotten Constitution, you may want to consider.
2nd, instead of having to chase an enemy, you might want to have some shooting options, like a DG Dakka Dread (still very relevant) instead of a 2nd Daemon Prince. With just Typhus, Daemon Prince and Poxwalkers, you still get the DG bonus.
Very minor suggestions. For what you're going for, a Typhus army, I think you got the crux of it. I don't play a Typhus list, though, and am not sure about if you should put all 30 Poxwalkers in a single squad.