I have a bear bones meths burner. Different type of stove, but similar ultralight concept. The idea is that the stove takes just enough fuel to boil that tin of water.
If the stove was able to take twice as much fuel as it needs to boil one pot, it could be half the size.
When you take the tin off, just let it burn out, it shouldn’t take long. Obvs try it and see!
Though I just looked at the video, and the lid looks like it has a liquid seal in it, so you should be able to reseal with unburned fuel still in there. Though the seal will be plastic, so you’d need to extinguish with the bottom of the pot and let it cool before you screw the lid on.