I think it's a long-standing issue with some of them seemingly counting for the wrong badge, but both badges certainly still work. I was able to get them just fine in St. Martial at the beginning of the Halloween event.
Edit:
Here's my proof. lol
Gangbuster is easily earned by hunting the boss-level Marcone Capos that spawn in Port Oakes. All Consiglieri and Underbosses seem to count only for the Untouchable badge now (though, before I16, they could be hunted in Nerva for Gangbuster credit).
Thank you for the response.
I´ll try it out later.
Your best bet is hunting them in St. Martial, in The Flop (and to a lesser extent, the Jackpot area to the south). There's a spot in The Flop where Consiglieres spawn in extremely high numbers (at one point I could target 8 from one vantage point). And they respawn quickly as well.
I just got Gangbuster on a villain two days ago using this method.
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It worked with my chars as well.
Thanks again for the quick responses. 
necro and helpfull tip
I used /bind q "target_custom_next enemy alive Consigliere" which helped a lot when running around the flop finding those bosses.
/Tom
Hi everyone.
I couldn´t find anything about this in the forums or in the known issue list.
I was hunting Marcone Consigliere in St. Martial for the Ganbuster badge to get the High Pain Threshold accolade on two of my villains but there was no progress.
Actually there wasn´t even a progress bar for the badge.
Instead the Marcone Consigliere counted on the progress bar for the Untouchable badge.
I tried it during the Halloween Event, i tried it after.
I tried to hunt every other family boss, because i thougt maybe the bosses which are normally required for the Untouchable badge would count for Gangbuster now.
Every family boss counts for the Untouchable Badge.
I also tried to hunt them with the CoX client set on the english an german language.
Can anybody confirm this?
I hope this issue doesn´t only exist Zukunft.^^
If that is the case, i guess this won´t have much priority to get fixed.