You can read through the entire pumpking thread, but I think graham is all wrong...
https://www.homebrewtalk.com/f12/southern-tier-pumking-clone-191381/
There's a lot of years of people trying, but it hasn't been cloned, because most people are trying to add flavor through flavor aids (natural or artificial) when southern tier doesn't add any type of flavors to that beer. They get the flavor from spices. The question is what is the combination of spices they use???
I personally don't like it that much. I feel like it taste like a butter bomb. I would say it's more of a "buttered rum" kind of flavor than anything else. I read through the entire thread (because I saw the rating on the beer, but never had it at the time) After I tasted it, I stopped trying. Schlafly pumping beer is AMAZING. That's the pumpkin beer I want to clone.
Anyway, look at the label on Warlock:
And compare it to the Pumpking label:
No where does it say anything about artificial or natural flavors on the pumpking label. And you have to understand that there is little to no difference from ARTIFICIAL and NATURAL flavors. They're both flavor aids. The difference is how they create the compounds.
Almond flavor can be created via the compounds found in Banana and Vinegar (this would be considered artificial because they "Create" the compound even if it's from natural products.
The same compound can be created via peach pits, but this also incorporates arsenic. However, it's considered NATURAL even though it's more dangerous than the artificial.