In the 2019 animated movie Batman: Hush, the main antagonist, Hush is revealed to be none other than
However, this is a complete deviation from the comics where the character of Hush was Bruce's childhood friend Dr. Thomas Elliot.
Although the key plot points of the story in the film coincides with the 12-issue storyline Batman: Hush (by Loeb and Lee) such as:
1. The Riddler was diagnosed with terminal cancer and uses one of the Lazarus Pits to cure himself.
2. Due to his exposure to the mystical properties of the Lazarus pit, he deduces that Bruce Wayne is Batman.
The major plot change was the reveal of the person behind the mask of Hush.
Is there an explanation provided by the writers (of the movie or the comics) as to why this drastic change was introduced in the movie?