Yeah, definitely not. All that guy did was take the "Coops Established 1917" part from my film positive image that I posted in
this thread (post #42) and added a drop shadow to it. You can see in this comparison GIF that it's the exact same image:
https://i.imgur.com/dw2D7QK.gif
And since I manually drew every letter/number in "Coops", Established", and "1917" in Illustrator, it isn't possible that it's just a coincidence.
In any case, that's just a site where anyone can upload an image and the company that runs the site will print it on a shirt and the uploader of the image gets some of the proceeds if the shirt sells. They are typically printed on a "direct-to-garment" (DTG) machine, which is a specialized inkjet printer, i.e, they aren't screen printed like the ones I made. The water-based inks that inkjet printers use don't last like properly cured screen printed plastisol does, and the print quality even when new oftentimes isn't all that great, especially when coming from one of those print-on-demand websites.
It's not the first time that someone has commandeered an image that I've posted online, and it probably won't be the last.