Wouldn't surprise me if it was an item contracted only for Home Depot; especially considering it's now priced at just over half what the standard-line DMT Diafold costs (in 2-grit format) from most retailers. I mentioned earlier, I feel like I've seen it before. Maybe it was in the HD stores for a while, as I've visited them pretty frequently for years, and always with an eye towards their inventory of sharpening gear in the tools aisle. Was always looking for the Norton Economy stones in SiC, before HD stopped carrying those in favor of DMT's products. But if I did see it there, it's been a while, at least a couple or three years or more. Might've been a poor seller in their stores, in that format. And now some volume discounter/reseller might be unloading the old inventory sitting in a warehouse somewhere.
After reading & posting in this thread yesterday, my curiosity prompted me to send an inquiry to DMT, via their contact page. I didn't send a photo, or a link to the 'seller' shown in Google's search results (sometimes vendors' contact forms don't like attachments or links in such messages, discarding them as spam), but asked if they'd ever made/sold a Diafold with those 'smoky ergonomic handles' of an odd shape. I'll wait & see if they get back in touch. If they do, I'll post here what they tell me.