Yeah, no. Bedel is just talking out of their ass. The current plan as I understand it is to patch the DS mode firmware to make it automatically patch DS roms, which are hardcoded to load from and write to the cartridge, to instead read and write to SD, treating the SD card as if it was the cartridge. Loading the entire game into RAM is terribly inefficient, as you've seen, and would take the same patches anyways. If the ROMs were just loaded into RAM as-is, they would still try to write to the cartridge slot unless more RAM was wasted emulating Slot-1 and redirecting all write commands, which might not even be possible without completely reverse-engineering the DS mode firmware.