This guy is striking with a 154CM steel blade and a laminated VG10 core blade with 420 J2 side steel (the 420 is on the spine) he's getting some good sparks!
Yep, he's using a Fällkniven knife. The sharp spine edges on their laminated stainless blades were designed to work well with a Swedish FireSteel. Also, FireSteels come with a stainless striker.