Argentina (presumably your local mirror is hosted in the same geographic locale as their ccTLD) is not currently listed in the Export Administration Regulations cited on the two pages you linked. That means that their only grounds for doing this is that they fear that they may be, or already have been, used as a mirror by someone covered by the EAR and that they will incur the wrath of the US as a result. Along with, presumably, every other Fedora mirror in the world that doesn't vet their downloads.
Also, as you point out, the EAR restrictions apply to both CentOS and Debian - indeed, Debian has a discussion on this very topic here, albeit a little dated: http://www.debian.org/legal/cryptoinmain - I think the crypto export restrictions have now actually been lifted, but I'm not 100% sure on that. The sole possible exception would be if there is a specific set of packages present in the default Fedora distro that are both not present in CentOS/Debian and subject to the export restrictions. Maybe, having pointed out that they continue to host CentOS/Debian, you could request clarification of what makes them exempt and take it from there?
Alternatively, they *are* a telco, and a state-owned one at that - not exactly a combination known for adopting a flexible approach! Although I admire your efforts in establishing a local Argentinian mirror, I suspect this may just be a matter of time before you end up calling it a day and using an alternative mirror.
--
Andy
The only person to have all his work done by Friday was Robinson Crusoe
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