Ah, right I got confused with that "blurry reflection look" and forgot that this video is only about lights. What a bozo I am!
I've never written SSR/cube reflection before -- it seems like you would have to turn off the lights before your SSR/cube reflection pass so you don't "double up" the reflections of the light, right? It Otherwise you would have one reflection from the analytic/punctual light model and another reflection from your SSR/cube reflection pass. Or is that not that big of a deal?
For cubemaps you turn off any direct contribution, correct.
Do you really ? I always thought you capture it n number of times to simulate light bounces ?