This setup took a long time. This is taken at 14mm on a full frame. The sheet of paper is curved to avoid distortion. There are three flashes being fired here, and I still couldn't stop the shadow of the tripod leg in the upper right hand corner.
I figured this would bomb only because it doesn't look wide angle.
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Looks like a lot of work went into the setup. Nicely done trickery.
I think the issue of why it didn't bomb is that it still looked wide enough and could have passed for a 20mm or so, which is probably the widest a few people have.
You basically took a good photograph that fit the challenge but did it in a way to trick people into thinking it didn't fit the challenge even though technically everything would fit the challenge because of the way it was written. Lol. This is like anti DPC, you wanted a good shot to score poorly.