Hi again everyone, OP here. This topic has raised quite a bit of interest, so I thought I would give anyone who wants to dive a little deeper all of the info available. I'm providing the link that was provided by Pinnacle Travel Document Systems, the company that supports Silversea travelers. Once I got deep into the weeds I did a lot of research on the topic of Chinese visas, which is difficult to share here, but the short results are that I found absolutely nothing encouraging. It appears that all of the detail required here is very recent and inexplicable. Anyway, have fun poking around and feel free to share thoughts. If you missed my post from earlier this morning, we've canceled this cruise and are opting for something that doesn't involve a visit to China.
https://pinnacle.gettraveldocs.com/expedited-visa-services/China-Tourist-Visa-Washington DC-visa-instructions46-566-1-3-FL-US#docRequirements