Thanks for completing this translation. So the mangaka decided not to include some parts of Johanssen's narration? In the original one of the most powerful passages was, "The Thing cannot be described - there is no language for such abysms of shrieking and immemorial lunacy, such eldritch contradictions of all matter, force, and cosmic order. A mountain walked or stumbled."
Seems like the mangaka decided to not include this or depict Cthulhu at that scale.