Not necessarily. It may be that the bug was known to others and that Google and Codenomicon were both monitoring channels used by more nefarious types. Both organizations may have independently 'discovered' the bug after each becoming aware that an exploit existed without having full details of the exploit.
And the story should have been about WHEN those nefarious types first started mentioning it, not about when the white-hats actually found it.
Did those blackhats find it by reading the code, or accidentally stumbling upon it in some way?
I suspect it was the former, but I think that discussion is more important than when Google detected it. After all, the implication is that
google discovered nothing, but simply heard about it in the hallway or something.