New vid from the same source as the four that liider posted above. This one shows pre-flight prep on what is presumably the accident Fokker, that plane beyond the high-wing twin prop.
The vid starts at 6:58 reported time, 25 minutes before the crash. Spraying the control surfaces starts near at that time, and continues for ~3.5 minutes.
Best that I can see, they sprayed only the horiz stabs.
Source: Youtube vid titled "1007 de-icing 27 dec 2019"