Re: Am I being cynical...
"No, because they aren't claiming Replicant would fix this hole."
Yes they are: "THE SOLUTION, Kocialkowski says, is to replace the device's stock Android firmware with a purely free-software OS, such as Replicant."
And there's the fact that they cover themselves frequently by stating it's not actually something unique to samsung and is common elsewhere - e.g. "And because this processor runs a proprietary operating system – like virtually all phone modems do".
While this is very likely an issue that should be addressed with device manufacturers, this sounds very much like it's primary purpose was to generate awareness of their OS coupled with a bit of fear to get people to use it.