>These events(amateur ones anyway) usually have a comic sans flyer made in word with some clip art pumpkins, let's be realistic.
No they don't. I've seen fliers and billboards for haunted houses for years, not a single one has had comic sans fliers made in word with some clip art pumpkins.
>The art and the flyers shown in the article look great.
No they don't. They look exactly like every other piece of AI generated "art," which is to say, aggressively mediocre.
It is certainly something that an amateur could have come up with, but I strongly suspect that had a human being done so, you wouldn't be calling it "great."