Even with slats out, if I did not respect that printed line "L/G dn at 200 kt", I can vividly see many a TRE looking very deeply in my eyes after a session.
Agree.
Plus I am going to fly the approach with the QRH (not the ECAM), approach portion of summaries.
Agree.
Unless you AND your colleague have this pervious knowledge that "if slats out, 200kts GD doesn't apply" then I would imagine you would more think the ECAM is wrong vs the QRH SUMMARY APPCH section.
End of the day, what is the safest, most cautious and most conservative method? I would say applying the 200kts / gear down to maximise controllability even if, perhaps, it is not strictly needed or demanded.