https://stockcake.com/i/art-deco-skyscraper_198545_35542
Ok so I did a quick google reverse image search on this and as it turns out the header image of the skyscraper does appear to be an edited version of this AI generated stock photo.
Now to the creator's defense, its very possible he just didn't know the original was Ai. He could've been searching up "stock images of skyscraper" and found that image and downloaded it without realizing it was Ai generated. He definitely should remove it and replace it with something not ai.