That could just mean Google's algorithm isn't perfect. And Google only needs to ensure that the disclaimer appears often enough so that people won't assume its presence means results were removed.
I definite recall it being stated that the disclaimers would be shown for name searches in Europe, not just name searches with results removed.
Saying it just tries to flag all names, but just doesn't spot "John Smith" or "Alison Smith" as names, while managing ones such as "James Smith" and "Bob Smith", isn't very plausible.
Bob Smith - message saying results removed
John Smith - no message
Sally Smith - no message
James Smith - message saying results removed
Claire Smith - no message
Deborah Smith - no message
Colin Smith - no message
Alison Smith - no message