actually, duping still exist but on the other way around unlike this one.. there are still lots of glitches/holes wherein you can test on it, explore on it, and even abused on it. but its better to used it discreetly if ever you found one.
so therefore, about this rumors i think it also exist. the main thing that i think they are using is the existence of other tools[programs]. there are some executable tools that can be easily detected by the HackShield (i think most of the time). on the other hand those undetected tools are more advance than the first one. in order to generate the first one, all you needed is to do something on the HackShield files. Now, most of the people are having hard time of making it undetected. Unlike those who are pro enough in doing some stuffs like on the HS files. like what i've said on the other tread, its for you to explore and discover something on the HS files when you're doing some &%^ (you know what i mean).. Once you're done with the HS files then all exe tools/third party programs are now undetected. but then again, its better to used it discreetly on your own.