That does not sound like SYG.
SYG says that if you have the option to retreat and the option to stand and face a mortal threat, you need not retreat; you may use the necessary amount of force to stop the threat.
The antis routinely misrepresent SYG as a way to undermine all self-defense with a firearm. Let's not do what they do. When we talk SYG, we should make sure that we represent SYG precisely and accurately.