Name: Evan Pioneer Valley south, MA, USA (Zone 6a)
It seems likely that Rosy Red Yarrow is a common name as noted above. Even the second link you provided is using it as a common name for Achillea Millefolium Rubra. I've added the common name to Yarrow (Achillea asplenifolia), as well as the Also sold as name of Achillea millefolium 'Rosy Red'.
