I'm confused does he film from a serial killers shed?
In the livestream he talks about growing up in a rural community, pretty sure he is still in the countryside - probably still at his parents' house. You can hear a lot of mooing and birb noises. So, in answer to your question, it is his shed and you will have a hard time finding the bodies.
He says he doesn't see the comparison between himself and the "new Joker", I don't see how he doesn't see it. He says he is aware a lot of people watch his content because they are "Kiwi Farms brained trolls" and I guess he is correct, still he doesn't really answer the point that a lot of the "Dogwhistles" are just memes that may have started on imageboards but are now used in contexts completely disconnected from those places or any "insidious" meaning they may have had originally, if they were even connected to those places to begin with. I'm pretty sure "leaf" has been used as a slang-term for Canadians for as long as Canada has been a thing and using that slang doesn't always (if ever) indicate someone is subtly hinting towards "The Day of the Rope". The fact he sees any usage of such memes as automatically "telling him everything he needs to know" about a person speaks to a strangely rigid mind, one may even go so far as to suggest "autistic".
All in all his livestream is pretty interesting if you can get over the very awkward presentation. His philosophy of diving into things in order to "brute force" learning about them explains a lot of his content. I also would be interested in knowing what he did to get banned from 4chan which necessitated him having to learn how to ban evade.
tl;dr review of the livestream - if you have an add-on that lets you go above 2x speed or you have a high tolerance for tongue-clicking and ums it is an okay watch, another interesting insight into the strange mind of J. D. Card.
EDIT: I believe this is the comic Card was looking for, hopefully he reads his thread