Article from the Wiltshire Gazette and Herald, which includes this:
Leading Avebury archaeologist Mike Pitts said he was sympathetic to the request from the druids. He said: "The issue of how we handle and display human remains in museums is of great importance."
http://www.gazetteandherald.co.uk/mostpopular.var.1164290.mostviewed.druids_call_for_burial.php
So it seems a "Leading Avebury archaeologist" didn't appear to have known about the bones being artificial either.
Like I said, let's compare like with like please.