A slightly more rigorous definition of "downsloping" might be helpful to avoid misunderstandings.
Does "downsloping" mean sloping down away from the touch-down area or the other way around?
If the RW slopes down away from the touch-down, then it must be true that a pilot looking for the usual sight-picture on the approach would position himself on a steeper than normal approach angle.
Whether or not this is "too" high is a value judgement. It might be perfectly acceptable but just not "normal".