Raw flour is really never safe to eat without first using it to bake foods and kill off the bacteria that can be in the flour.
The raw flour itself is safe to eat but what makes the raw flour bad to eat is the bacteria and other droppings that could be in the raw flour.
When you cook the flour the bacteria in the flour is killed off.
So make sure to never eat raw flour otherwise you could potentially get sick.
The temperature at where E coli bacteria dies and is killed is 160 F so when you bake foods the E coli is killed.
As long as you bake the food all the way through and make sure the baked goods are fully done the E coli will not be able to survive in those hot temperatures.
So yes E coli is killed in the baking process.
If you eat raw flour, raw cookie dough, raw cake batter etc you could possibly get E coli poisoning.
However the risk is small but I still would avoid eating any raw cookie dough, raw flour, raw cake batter etc just because it's not worth the risk of getting E coli poisoning.