alt Hacker NewsYa, the article doesn't specifically use the word demand but in the final section Is It Good? says "The estimated 12k to 15k weekly sales volume reflects the fact that this is not a mainstream home run." this implies that the 12k-15k is a demand number but we can't reach that conclusion with this data.
it also says:
> On top of that, Valve may be constrained in the number of units they can actually ship, so there may be downward pressure on a higher demand. We don’t know for sure.