I think your math is off, the digital share would need to be around 42% to match 2.637 million. 29% would only read 2.425 million.
1. Animal Crossing is very likely the biggest opening ever for a game in Japan.
Current record holder is Pokemon Black&White at 2.637M
New Horizons needs a digital share of only 29% to beat that.
2. Switch hardware week is the biggest ever in Japan, even bigger than launch
3. This huge hardware week also boosts Switch hardware total over Wii LTD numbers.
Digital ratio is based on total units, not only physical ones