No, none of the DSi compatible DS flashcards support the autoboot flag (since any non-original header would make them incompatible with unmodded 23DSi consoles)
Since the firmware can be rewritten, it is in theory possible to create one that sends the autoboot flag, but I can't say anyone tried
Of course you could install FlashMe, but that does even more - it skips the whole boot animation
Thanks for confirming this. It's too bad because I wanted to use this card on a DSi XL rather than a 2/3DS, so this is regrettable. Are there still any older DSi only cards that support the autoboot flag? Maybe I can track down one of those.













