Leveling guide error

[Birch]

https://classicwow.live/leveling/alliance/solo/human/rogue?section=30&step=6

I've killed 100+ Deadwood furbolgs indicated by the guide (Warriors, Gardeners, Pathfinders) and have not seen a single Deadwood Headdress Feather.

Edit: Deadwood Headdress Feathers will not drop until after turning in Timbermaw Ally, yet the guide would have the player collect them before turning in this quest. Further proof that this guide is a piece of shit.