Confirmed, the card and pedometer use IR for communication so it's impossible to use a Pokéwalk with the current generation of flash cards.

rough translation of Pokéwalk specs:

Specifications
Batteries: button batteries, used a one (CR2032)
Weight: about 21g (including batteries)
Body Dimensions: Diameter: 48mm Thickness: 13.9mm (not including key top)
Supports infrared communication
With a pedometer
"Pokemon Gold Heart" and "Pokemon Silver Seoul" included with

http://www.4gamer.net/games/091/G009105/20090608005/