He doesn't remember having killed, no, but it's unbelievable that no one would have filled him in on what he missed. At minimum, he knows the facts. And it's not *his* memory, specifically, that's relevant here; what's relevant is that we, the fans, can go back and read those stories, that we the fans know in extensive, series-long detail what Grimdark!Ollie looks like and how he crosses that line, and the ways in which he questions himself and does not question himself when he does it, and should be able to expect a storyline that covers similar ground to be consistent with that take. What's relevant is that *Dinah,* the one who's freaking out about Ollie crossing the line, remembers when he killed before, and how he behaved afterward, and what it meant for him and for them as a couple, and should be expected to interact with him from the perspective of having that memory and experience.