Attack on Titan / Shingeki No Kyojin - Final Chapter of Attack on Titan put into perspective

It's from Billy Bat chapter 102, author is naoki urasawa (Monster, 20th century boys).
Einstein and Hitler are talking and end up discussing theoretical time travel which leads to them talking about the powers of titular Billy Bat, who Hitler wants to use to unfuck things with his life.
It's also where this notable image came from

I am morbidly curious about the context behind the original picture here.