Well, it seems that Strong Sinew has replaced Sinew for the DEX+ & Bowstring recipes. However the Poison (Minor, Medium, & Large) + Sinew = Debuff DEX recipes do not use Strong Sinew.

Destroy1Transform2 CON_Potion_Poison_A + LOOT_Sinew_A_Strong = CON_Potion_Debuf_Dexterity_A, Crafting 2
Destroy1Transform2 CON_Potion_Poison_Medium_A + LOOT_Sinew_A_Strong = CON_Potion_Debuf_Dexterity_A, Crafting 2
Destroy1Transform2 CON_Potion_Poison_Large_A + LOOT_Sinew_A_Strong = CON_Potion_Debuf_Dexterity_A, Crafting 2