Sales trackers track when a product was sold, not when it was activated. Technically, DQH has already sold a number of copies.
They can be added in February, sure, but those purchases were made in 2014.
It doesn't matter when they report the sales, though, only that they report it.
There are many examples from Famitsu adding sales from previous SKUs at later releases. It's not a new methology, the difference is the hw bundle wasn't given public numbers for other reasons.