Beat vegan butter and "cream cheese" in a large mixing bowl until creamed. Add vanilla, salt, and powdered sugar one cup at a time. Add milk beat until light and fluffy. You may need to add more milk as needed for frosting consistency to be light and fluffy.
Spread a generous amount of frosting on the sides of the cake and use a cake spatula to evenly spread it. You can decorate as desired or leave it simple. Top with pecans.
It's best to store the cake in something such as a cake dome to prevent it drying out and keep in the fridge.