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This reminds me of their Mario Kart 8 Deluxe PR from last year.

REDMOND, Wash.–(BUSINESS WIRE)– With more than 459,000 combined packaged and digital sales in the U.S. on launch day alone (April 28), Mario Kart 8 Deluxe for the Nintendo Switch system is the fastest-selling game in the long-running Mario Kart series....The solid sales numbers for Mario Kart 8 Deluxe equate to an attach rate of 45 percent – meaning nearly one in two Nintendo Switch owners in the U.S. purchased a copy of Mario Kart 8 Deluxe on the first day it was available.

https://nintendoeverything.com/mario-kart-8-deluxe-sells-459000-copies-in-the-us-on-launch-day-fastest-selling-mario-kart-game/

April NPD wan't out yet so people used that attach percentage to figure out what Switch sold in April. If 459k was 45% of US Switch sales that meant that Switch was up to 1,021,000 units, meaning Switch sold 115,000 throughout April.

Switch ended up selling 280k in April, according to NPD.