No, it’s not filmic. You have asked color balance rgb to create a spot that’s so bright you’d be burnt to a crisp if light so intense ever rhit you. Then, in filmic, you asked to blur extreme highlights (because that’s all filmic’s highlight recovery does). As a result, the super-bright pixels were blurred to smoothen the transition.
I know it’s inconvenient to switch to the last tab of color balance and pick the white fulcrum, and to pay attention to not raising the brilliance above 1.2. But it is what it is, at least for now.