According to here it seems to be from the comic Munden’s Bar by Martha Thomass, Valerie D’Orazio, Norm Breyfogle, Bob Pinaha, and Matt Webb
I just checked Dark Crisis but it seems it's available.
Have you ever read The Batman Files by Matthew Manning?
It's a very, very detailed history of the Pre-New 52 Batman story that's written and presented as if they are the in-universe private files, journals, and thoughts of Bruce Wayne and his allies.
It's amazing, and as someone who (thanks to my ADHD) also gets hyperfixations, it's one of my favorite ways to experience all of the Bat Mythos' history, and it can be (ahem) "found" online veerrrry easily
Comic gaters are full of shit when it comes to SoK,tô the point that the writer take their time on Twitter and correct all the rumors of doing unwell.
But the run isn't flawless ,even though I loved the LGBT couple in the suicide squad by the same writer,the jon and pink-guy couple dont have the same charm to me
Well, I did just check amazon and behold. Hopefully it won't get pushed back again.