Being able to read helps a lot... stupid me...
Though, I have to admit that I don't fully understand the content of the explanation.
The reason for this behaviour seems to be that for the complete m x m - matrix of correlations (for m attributes) the correlations will not be recalculated and hence not checked if one of the attributes of the current pair was already marked for removal. That means for three attributes a1, a2, and a3 that it might be that a2 was already ruled out by the negative correlation with a1 and is now not able to rule out a3 any longer.
So in the end I am not able to use this operator as I don't know in what cases attributes are removed correctly?
I am wondering then what the inteded use scenario is like?
Anyway, thanks a lot