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Why do they say otherwise on their own website?

Well I have bo idea. All I know is when I purchase on either .de, .co.uk or .ie the transaction goes through immediately. I have 3D secure enabled.

The text on that link of yours is sneaky though:

"...you MAY be asked to..." (Emphasis mine)

Because you can add them to a "That Store is safe" list, and you won't get asked again. You probably did this at some point