The Coflein entry gives an unpublished Clwyd-Powys Archaeological Trust report as its source. To my experience, industrial entries in Coflein sometimes derive from poor quality secondary sources so, if a Coflein entry doesn't agree with good quality or primary sources, it may simply be that the source used by Coflein is wrong. It would be worth asking CPAT for sight of the relevant report which, if written to the usual standard, will be fully sourced and referenced, allowing you to chase the statements to their origins.