I think all the lines (except Overground etc) share rolling stock, and just change the number of train cars, so it's impossible to tell

edit: this has been a slow process since 2010, so they are slowly converting to "S-Stock" from previous stock. I've not lived in London for a decade now, so I can't comment first hand, but I recall the District/Circle lines used to be different to the Northern/Central lines. I dont know if that's changed.

The video did not provide the exact metro line.