For comparison to other first week console sales in Japan (also Famitsu)

PS2 FW - 630,552
GBA FW- 611,504
DS FW- 468,880
3DS FW - 374,764
Wii FW - 371,936
Switch 1 FW - 330,637
PS Vita FW - 324,859
PS4 FW - 322,083

Switch 2 with 4 days of tracking: 947,931 and these do NOT count My Nintendo Store numbers as Famitsu does not track those so it is easily over a 1 million sold in 4 days in Japan ALONE