i just got done talking to him on IRC, heres the log:
c0d3wiz: so how did you do it?
flipnoteman12: sd card
c0d3wiz: well i know that, i meant, how did you hack the sd card slot?
flipnoteman12: i cannot tell exactly how i did this at this time, what i can tell you is it had something to do with linux.
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What did he mean by linux? ds linux ported for the dsi?
because ds linux can list all devises hooked up to the ds, (e.g., slot-2), so maybe if he got ds linux working on the dsi it listed the sd port?