I think it's still in the Patreon version only, if you're playing the free release. Think there's a guide somewhere in google doc form if you're playing the patreon one.
Honestly, the guide doesnt really help that much. Its pretty confusing and doesnt give that much info to send you in the right direction. But any and all help is needed otherwise youd be going in circles 😅😅
Are you referring to his second ending? I followed the guide and it's triggered by the protagonist running out of stamina while playing with Sep after he replaces Nel to help Sep with his work.