1. Oda had Bonney mention specifically it’s only temporary on other people. Meaning the user can be permanently de aged.
2. She calls him that once but that’s because even though she saw kumas memories and know she was once Ginny, Bonney has no memories or feelings of when she was Ginny. She didn’t get Bonneys memories, just kumas. She’s still Bonney. And kuma is still her father.