You are right, of course BS EN 61008 should trip within 300mS at IΔn. That's what comes of trying to rush stuff.
True, but in the sense of a pragmatic 'imperfect' test, I think that human beings can distinguish between trips which are more-or-less 'instantaneous' (say, well under 500 mS) and those which are 'delayed' (say, well over 500 mS). Also, let's face it, when people are told to press the test button regularly, there is no mention of how quickly the device should operate - so they may well 'feel reassured' if it operates in a second or two.
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