I've surfed Alibaba before, and found pages advertising what appeared to be just about every ABDL diaper I'd ever seen. ABU was not spared. These links have been posted a few times.
As somebody with some experience having things manufactured in China, I'll can tell you that this is one reason why doing business with Chinese manufacturers is challenging. My company has several times has designs blatantly ripped off and sold directly. A lot of these Chinese manufacturers have no qualms about doing that, and going after them for it is extremely difficult. It's one of the reasons why, when it's possible to do so, we now go out of our way to factor designs into multiple non-functional pieces, source the manufacturing from multiple manufacturers, and then have the finished products assembled elsewhere. It still manages to be cheaper than manufacturing domestically, and so far, no theft.
All that said, given how willing many of these manufacturers seem to be to rip stuff off, I wouldn't be surprised if the diaper manufacturer linked in this thread just grabbed an "ABDL Diaper" image off the web and used it. Cheaper than taking a picture of one of their own creations, and these places are all about cheap!