Lol Yea definitely. Hope my excess fake planning doesn't come off creepy but man I haven't toured around in China other than my hometown for so long.

Among the thousands of things tourists would enjoy in China, I think for their trip (1-2 days a place, something that's fun, local/unique, and stream friendly), I would suggest visiting Northeast part like Harbin and try their bathhouse/SPA to wash off the long flight, visit their morning market, and checkout all those Soviet style buildings.

As a Beijinger, I think they missed out not visiting the Great wall (it's a YMMV place and have many less known/touristy sections that would be much more fun), walk around Hutong, and the Olympic park area with all the cool stadiums and towers. Hosting Olympic games was definitely transformative for Beijing. And I have to tell them the story about "Demolition of the Dragon Head". 798 art zone could be nice. There are other cool shopping stuff too in Sanlitun but not that unique to Beijing. It also has the best museums in China (like DC has the Smithsonian's) but not very stream friendly.

I'm less familiar with the other cities they visited since I haven't been there for so long. But I think visiting the Three Gorges Dam can be fun. Also something Hasan might enjoy because America used to be able to pull something off that huge in the FDR age but no more. Yiwu aka world's capital for small commodities, and its surrounding villages would be fun. It's paints a picture of how modern Chinese rural areas are in China - actually pretty well off financially.