New Starbucks drink

Is the new Iced toasted vanilla oatmilk shake espresso kosher

Post please Ingredients. For Pesach definitely not.

Ice, oatmilk,brewed espresso, toasted vanilla flavored syrup [Suger,water, natural flavors,preservative: potassium sorbate,citric acid]

Its kosher (not for Pesach)

How is it kosher? Don’t they toast the vanilla syrup in the NOT KOSHER oven

They don’t toast syrups in ovens. And what makes the ovens in the manufacturing plants not-kosher?