It says in the article:

Finger died in obscurity in 1974, with artist Bob Kane credited as Batman’s only creator. Finger’s only child was a son, Fred Finger, who was gay and died in 1992 at age 43 of AIDS complications. Bill Finger was presumed to have no living heirs, meaning there was no one to press DC Comics to acknowledge Finger’s work.

But Nobleman discovered Fred Finger had a daughter, Athena Finger. That, he said, is a showcase moment of the presentation he estimates he has given 1,000 times at schools.

“It’s the biggest twist of the story, and it’s usually when I get the most gasps,” Nobleman said. “It’s just a totally record-scratch moment.”

Not sure, why you're thinking this is purely about the initial creation of Batman...