I don't know what that link is - but if you are referring to a heating element from a toaster oven, I don't see why the heating wouldn't be uniform.
current passes through and is the same current along the wire. The current and resistance causes the wire to get hot.
The result might not be even heating though, due to how the energy radiates out and bounces around. There are numerous, countless examples of diy reflow ovens on the internet.