I have also taken in parts of this before on an earlier airing. It is well done. Too bad on the pseudo colouring on some of the old black and white film stock.
Though that might be needed if the original print is too deteriorated.
There is a saying in the film world that, "Life is in color, but black and white is more realistic."
However, with regards to documentary black and white film stock of multi-generations and plus 100 years ago such as those about WWI the following would be more true:
The coloring of WWI film stock puts flesh and blood on the grainy moving images of those people of generations long, long ago past and of times no longer connected nor reachable and available to us, the generations of today.
Looking at those grainy moving images is like looking into twilight dreams of subconsciousness where what was all too real also seems to be indistinguishable from a twilight, dreamlike state not relatable with our existence today.
Coloring the faces, the hands, putting colored flesh and blood to those soldiers and people of long ago, lost to us generations, makes those people back then, seem more like us today and thus forms a real, life and blood connection with us to with those who are longer available to us except in images
They of 100 plus years ago, are us and we are them.
Remember, life is in color.