They’re just (basically) two 4" phone screens, one above the other. So its only going to be modern capacitive stylus like is pictured.

That’s the ‘trade-off’ with these. You get modern and bright, upscale screens but you lose that original stylus input.

That said, I’m obsessed with the DSi consoles, and I’ve actually enjoyed using this stylus on it. Or, whatever misgivings I initially had disappeared after an hour or so, when I got used to it.