[wasmperson]

I don't think Casey has ever claimed to be the developer of Bink 2. He usually brings it up when explaining the kind of work that was performed at Rad Game Tools, then explicitly states that his work was largely on Granny 3d in particular.

[CyMonk]

"Bink [...] was written and researched by [...] mostly Fabian Giesen, Casey Muratori and Jeff Roberts.", Bink Video Credits

https://www.radgametools.com/binkhcrd.htm