Why are these pages blank that Biden signs?

Question

https://www.youtube.com/watch?v=evhUYk9HG7w

Answer 1

You sad Cons are getting even more desperate to dig up all sorts of pathetic bullshyt.

Answer 2

yes. I slowed it down and there is writing there.

Answer 3

They aren't although in the first one shown it appears that the page facing is blank I can make out writing on the page he signed.