Good news: everything's ok guys!
I just called Volker Rieck from FDS File Defense Service. They were indeed hired by Bandai Namco, but not the germany division, but the
US Europe one, to take down all the debug mode patches.
Dutante's DSfix was not part of the plan!
Mr. Rieck is currently writing emails to Namco and dropbox to clear everything. Durante is allowed to reupload the patch, there is nothing wrong with it.
Mr. Rieck was nice and took the time to explain the situation to me. I am currently on the phone, so I might add a bit more information when I come home in a few hours.
edit: also shame on the guy who send him a mail full of threats. He was a bit disturbed by that.
edit2: It was Bamco Europe who was asked by Bamco Japan, not US. Misremembered that, sorry!