it would be good to know if they use it, I know it doesn’t indicate they are open source (which, most online stores aren’t), but if they use any open source library, or api, etc, do they credit them correctly? (for example using software licensed under BSD, etc). That can be a way of knowing if they are stealing other people’s data or not.
I’m sure their infrastructure includes various GOL software, like most tech/ecommerce companies. China is not known for caring much about copyright (or copyleft) and I doubt if they provide much information about that. I’m not sure why you think it would help indicate how much personal information they’re storing from people, and in any event, I think we can assume they at least store the same sort of info about customers and web visitors as sites like Amazon or Google.