[wlesieutre]

I don't know about that particular quote, but this has a photo of the WWDC side claiming 64-bit Carbon and Cocoa, so that was definitely the original plan

https://www.wired.com/2007/06/leopard-won-t-support-64-bit-c...

[microtherion]

Hmm, that is plausible. I stand corrected.