I also visited the website. I'm a bit surprised that the flavor profile for Potato Slayer indicates it is a 'spud-specific' seasoning. Seems that limits its sale potential.
Never heard of Potato Slayet until reading this post. I am familiar with Onion Butter, another of F&SS's product. Because I watch my sodium intake, I haven't purchased it (and now discovery of their State Fair Pickle and Cheese Batter), but I really want to try and may just purchase in spite of their salt content.
I think the Potato Slayer would enhance cooking zucchini since some of the Potato Slaher ingrefients (garlic, onion, and dill weed) are used in preparing zucchini-- at least I use).