Nice- thanks for posting... I use a different method , but they are making a bigger print than what I do, I like to specialize on 30 x 40 so I have two methods of process.. One is flat trays with 50 litres of chemicals in each i have enough room for 6 trays so its pretty easy to go from dev, stop, fix , fix, wash.
Another method is the trough which you see in this video... I use home depot plastic under bed containers which hold much more chemicals and i scroll like you see the young man doing, only I am scrolling 30 inch v 10 ft.

I know there are those here doing much larger prints and have come to their own methods of working, lately I have been liking the smaller print so when I do 30 x40 it feels like a gigantic print.

One day I will move to a location where rent is not so precious and maybe set up a rental mural room for supersize prints... I have the trays but not the space right now which is the big problem for Urban printers.