Glad you liked the website coverage.
As far as I am concerned, The Macallan have issued a formal statement to the effect that they don't colour their malts, and I don't really see what else they can say.
Maybe you know a chemist who can test Macallan samples, since it's obviously a question causing forum-users many sleepless nights ...
On a more serious note though - how much does it REALLY matter? I think the debates about the overall quality of the product are more interesting.