Alleged Lucifer Plaque in 8-1

I remember seeing a post about lucifer being the angle that is omitted from the painting in 8-1. However, I can't find the post where the user "uncovers" the plaque. And I was checking the [ultrakill.wiki.gg](http://ultrakill.wiki.gg) and it doesn't mention this observation. I am wondering if the person who "uncovered" it actually did that at all, or if the image they had was purely speculative. I have not been able to find the post I am thinking of to confirm anything