SPOILER!! How on earth do I beat scar?

He one hits me in my diamond exo and it doesn't matter what I use for cover he just shoots me straight through any wall...

I don't know if there's something I'm not getting but even when I manage to get him close enough to hit the button, those damn tvs don't even do anything to him! Is this fight bugged currently on ps5?? this is my second time round trying this in hopes that my save was maybe bugged but it's still literally impossible.