thats like European style linen backing.
But doesnt the European style still used a linen backing? I know in the UK the linen is sometimes a thinner type, but it isnt just a cotton material (like cotton sheet material) that has been washed with ammonia, like the guy in the video used.
I have one poster that was backed in the "European style," and it had no retouching done to it, aside from it being backed (and the linen backing is not soft or flimsy at all). It was simply backed to conserve it, leaving any historical blemishes and "life-bumps" intact and visible.