1. After 15 September, Team R4 will do something for the fake card, original program(firmware) with Fake R4 may damage your DS machine (brick), original R4 will have no problem with this program.
2. Make sure you have buy a original R4 (see photo below), if you brick your DS with fake R4, please go ask the selling shop and Team R4 will not admitted this liability.
If this is the genuine R4 package then looks like you guys are somewhat safe.
According to my research the fake R4 using internal memory instead of using a Micro SD card on the genuine but we will know this when someone will end up bricking their DS.
To know more about the fake R4DS, read it in MyDS News.