I think people often confuse "attractant" with "something hogs will eat." Hogs will eat a lot of stuff (but not pumpkins in my experience), but that doesn't really make it and attractant per se. Just because it has a strong smell doesn't mean it will attract hogs even if they can smell it 5 miles away. They have a lot of resources along the way of those 5 miles, dangers, etc.
I have tried 20-30 miracle products and recipes for attracting hogs, mostly, but not always with sterile feeder testing. I have tried adding said miracle attractant to my feeder yard to see if I could make hogs appear that night when I hadn't been seeing hogs. Diesel corn, soured corn (of many varieties), and a couple commercial products all failed to give me a win if the hogs weren't already expected to show up (because they showed up regularly and so weren't expected to stop).
For more sterile testing, I will set up a feeding station away from where I hunt and see if said miracle product will "really bring them in" as people claim. Basically, hogs don't seem to find the stuff any faster than plain old corn. If the goal was to get raccoons, I would say that several products/recipes work great, but not hogs.
I remember watching Pigman on TV try some new hog attractant. The test was on his land and he spread the stuff out under a feeder that apparently had been in use at that location for quite a long time based on the wear and tear on the ground around it. He spread the stuff out and hunted the first night. Nada. The next morning, he gets a single little boar and then proclaims how the hog attractant brought in that boar, quick! Whether the boar came to the new attractant or to the feeder that has been running for years (and was currently running during the episode), it is hard to say.
I have tried one commercial product, no longer on the market, that was claimed to be a great hog attractant. It was pungent. It was anything but an attractant. In fact, it kept away deer, raccoons, and mice that I would always see come to the feeder and the hogs didn't show up either. Here I will segue into a related issue that hogs often will avoid areas known to them if something changes drastically, like all of a sudden there is a new and strong smell where they wasn't one previously. They will avoid it for a few days until it becomes the norm.
What about diesel? People report decent results from it, but I have never seen it work in sterile testing. I brought out some diesel soaked towels to see if the smell really attracts them or not. Hogs never came through the area to the diesel towels. I got more action out of a rabbit, raccoons, and deer coming over and smelling the towels, but not hogs.
I have seen deer and raccoons eat diesel corn. They will usually avoid it, but if they are hungry, they will eat it. Of course, diesel is poisonous. If you are a meat hunter, you may not want to consume hogs that are eating diesel corn, or the deer that sometimes feed on it as well. Based on the MSDS, I don't think I want to consume anything that may be eating diesel. https://www.globalp.com/wp-content/uploads/2019/10/SDS_Diesel_Fuel_Final.pdf