The four cables in the middle; two brown and two grey. They need to be disconnected in order for them not to tear when separating the bottom shell of the computer at the later stage.
There’s a cable still connected between the display and the top case in between these two steps. Be sure to disconnect it before pulling the two apart completely.
Honestly made an account to comment on this repair guide, this is extremely incomplete. I’d go as far as saying you’re likely to damage the product by relying solely on this guide, I would turn to a breakdown on YouTube instead. I’m not sure if this is listed under the correct product.