Spoiler
Did the dev post that on twitter or tiktok or something, or is that just a theory? Because according to hints in game and others in the comments, the cat isn't just a demon, but apparently Ryuk from Death Note? I'm a little rusty on the series, but I don't think that was how things worked.
If you are right, then the question remains WHY the hanging and murder? Zilas could've just dropped dead when his heart stopped or our character could have found him frozen like he should have been originally, which imo would have been more poetic and less gross than the route the dev did take with the endings.