Piracy is abundant in Chinese knockoff products, and, illegal or not, the laws are almost impossible to enforce due to the sheer scale of the problem. The two biggest big box chains in this country would go broke in six months if patent and labeling laws were actually enforced, probably many other retail sellers too. It's an epidemic, and rife on the web.
Expired patent or not, does not equate to misappropriating a known brand name and attaching it to a knockoff product. That's just plain counterfeiting, likewise an epidemic these days. And there's nothing big enough in scale in darkroom products to even tempt a lawyer to go to bat for you. It's peanuts compared to the staggering volume of violations in other sectors, which don't get defended either, but sometimes do get interdicted, import-wise, just to reappear labeled as something else. Only the consumer holds the real keys to the problem.
But in this instance, I did not see any alleged Jobo label on the products, or any claim to represent Jobo, but just generic replacements of probably inferior quality. Not much different than buying a generic "Technika-style" lensboard which doesn't claim to actually be made by Linhof.