I did not know much stuff about Enslaved, just that it was reviewed well I think, and I never even heard about Zoids. I guess the Horizon designers might have had some inspiration from there, while it does not look copied. Transformers also had a dino line, so that probably inspired the Zoids guys...
And I guess post apocalyptic nature and cities inevitably look the same. So screenshots from Enslaved can probably also look similar to Last of Us, Resistance... if only that is shown.
But this does look insanely close in those defining enemies, effects, clothes designs, including the nonsenscial ceremonial head stuff, no tribesman ever would wear just casually. Doesn't matter that the gameplay is different. The whole design team did nothing but take core elements from Horizon's language and alter it almost not at all.
I don't know, I think Palworld, or Starcraft and such things should not exist, not when it's that blatant, but locking up even unique designs might also be too much at some point. Sona Buvelle from LoL might have a similar hair color as Hatsune Miku but looks a bit different. You can't avoid some shade of green and two ponytails at some point if you try to not have only regular blonde, brown, black haired heroes and have a ton of characters.
But altering it a bit, mix it with other stuff. So it's not entirely one game that's being riped off.
This game is not an actual copy of every little detail either, sure, but it looks like Horizon, and does not look like Enslaved which makes their argument just pointless.