Yeah, these figures are bullshit manipulation. The 1% "real tax rate" figure specifically comes from a fantasy where we imagine that Jeff Bezos's net worth is his income.
I still hope Bernie Sanders is better than this, but it doesn't look good.
As a concrete example of why this is wrong thinking, let's consider that you buy a very nice house with a lake from a small secluded neighborhood that seems to be dying for $500K. Then let's further imagine that you got so lucky that the house you bought was in the center of a new town that for some reason grows magnificently over the next ten years. Things like that happened all the time in the 1900s.
Your house now in worth $20M. Should you pay income tax for $19.5M even if you don't sell the house?