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@OP:
Don't let the negative comments fool you, you're perfectly right of course:

It's the video game console manufacturer themselves who determine their launch sales numbers.
Because unless the producer would ship an insanely high amount of hardware units for launch, it's guaranteed that your product will get sold out in most places shortly after launch - so the launch sales numbers are more or less identical to the numbers of units shipped for launch.

And these days, with for example all kinds of online shops accepting "preorders" etc. months before launch, the console manufacturers can estimate the demand at launch quite precisely.
If I were a video game console producer, I'd try to always ship about 10-20% more units for launch than at the launch of the previous console. That way, I'd get free "launch sales record!"-news every single time one of my consoles launches.