[Const-me]

The resolution is not that great, 1212 pixels / 2.5 km gives 2 meters / pixel.

The ground wind speed at the time of eruption was below 5 m/s, i.e. the video plays much faster then real-time.

If you’ll download the video, pause it, skip between frames, you’ll notice different parts were shot from different positions and with different resolutions.

They probably abused the fact clouds move in very predictable manner. They took several satellite images from whatever satellites happen to pass roughly above the volcano, and used creative video editing to make a smooth video from those several frames.