You must rememb that 332,000 is withouth digital.
The 1:4 ratio from Nintendo, must include it. Honestly considering the digital ratio Splatoon 1 had on Wii U (165K first month, 136K retail, 17% digital), is very likely Splatoon 2 did over 400K first month.
Well, to be honest i agree that November probabily has Splatoon 2 at 200K or more, but mostly i think the 1:4 ratio lifetime is surely rounded.
Look at Mario Odyssey, we have estimate who put him over Star Wars at retail, which sold almost 900k witouth digital, so Mario Odyssey is at least at >900K this month (probabily one million), and LT sales are confirmed above 2 million right now, yet Reggie talked about a 50% attach rate, which would only put Mario Odyssey at 1.7 million.
Anyway, Skyrim first month on Switch is very good, nothing to say here. So far third party on Switch are doing very good, this is a good sign for the future support!