let me step in for a sec and see if I can interpret what he is saying before you guys start calling each other names. what you are trying to say regardless of what you choose the answer is going to be the same, right?
so if I use your example in his way of thinking, (example) you are harry killer, you have three options, the poison, the knife, and the gun, each lead to a different out come, and each of those options you get the choice if you want to slowly kill him or kill him right up. For the knife, you get the option to slit his throat, cut chunks of his skin, or cut part of his body (such as fingers, toes, tongue, etc.). For the gun, you can shot him in his heart or head, you can use him as a target practice and he is the target, or whenever you shot a part of his body you burn him using the muzzle of the gun. For the poison, you can inject the victim using a syring, you can cook something and add the poison, so the victim can eat, you can also fill the room with poisonous gas..... I'll stop adding things before someone call me a psychopath lol
What I think he is referring, is not about the ending, harry is fucked either way, is how the options branch out to have a different outcome on the story and those branches have their own options that add more story to the game. I could be wrong but I think that's what he meant to say when the options are essentially pointless