This doesnt matter lol, the issue is RIGHT NOW, Luffy is on the ground trapped with everyone else and depowered. In the context of the scene before the flashback, he's just as helpless as everyone else.
The Robot saving Bonney is still by virtue Nika saving her, because it is activated by his drums/heartbeat.
Kuma saving Bonney makes symbolic sense as well. Bonney has seen Luffy's form and has made zero comments about it being "Nika". She doesnt even know what he looks like.