Sorry mate, but you need to take wikipedia with a pinch of salt. In that case the quote comes from a quote from Eurogamer who are quoting what CA are saying...and CA are going to say that, aren't they. Whether what they're saying is true or not, is up to you to decide. Think back to what they told you about Rome 2 prior to release and after release...? Still feel like trusting what CA tells you?
Anyway, Steam spy has sales up to 400 k now - so there might be some truth in what they say.
But what's more important than the spin they're putting on this - which is CA's goal, to spin it for marketing - is that sales prior to release day were clearly low. Like I said, in my OP, people were clearly holding off their pre-order. I think on release day they had 200 k sales. Four days later that's doubled. Which is interesting. But no matter what spin CA put on this, and what spin the games sites willingly report for them, this isn't a story about how they've sold 500 k units in 4 days. This is a story about how they DIDN'T sell 500 k units in pre-orders. Which is excellent news. It seems many customers really don't trust CA's releases any more. I'm not bothered about how many sales they get, how many sales they have...there's already too much drama on this site. I'm only interested in what appears to be really low pre-orders. This would explain why they opted to extend the cut content chaos marketing bull for a week after release.
So basically guys, well done. You didn't pre-order. I think that's damn fine behaviour from the fanbase. What you do with your money now, is up to you. But the fact that CA can't rely on your money before they release a game sends them a strong message. One which they must definitely have been noticed.
(Just for your comparison about what kind of pre-orders companies with loyal fanbases can enjoy -XCOM 2 had a solid 650-700 k units sold in pre-orders before release - it's probably a smaller fanbase to Warhammer and TW combined -yet they had very high pre-order sales. Since release the number of owners has increased slowly, so most owners bought theirs before or at release. That's the kind of buying pattern CA used to rely on. Not anymore, it would seem. Thank God)
Or maybe, just maybe People brought it post release because the Chaos Warriors are free for the 1st week and there was no particular reason to pre order it anymore.