I've got the update and the dark mode is now working, but I do have some feedback:
1. There isn't enough to differentiate between different UI elements. Post backgrounds share the same shade of grey as the header. The notification page is not great at all as the entire screen is the same shade of grey, and it looks quite ugly. Additionally I think the shade of grey used when writing posts is too light and could do with being full black.
2. The app should be able to change the theme depending on the system setting. Most apps do this, and I even know some adult websites that manage it.
3. The purple colour that became the main colour of TSR (sadly replacing the more pleasant light blue) is strangely absent. The lime green secondary colour is much more visible. This isn't a complaint about functionality, but I do find it interesting.
I hope that a dark mode can be added to the website as well, it really needs it.