Can Alibaba's sales page be used as evidence to sue the other party for appearance patent infringement?

This can be used as evidence, but it is not complete evidence. It can only be regarded as circumstantial evidence, because it appears on Alibaba and can only be treated as stealing pictures. You can buy their products through a third party, or you can buy their products through a notary public (in the case of notarization) as evidence. Of course, if you are not sure, you can buy a product first to see if it has been stolen.