Again I have to ask why would tidal locking matter for LOS? Tidally locked planets still rotate, they only don't seem to rotate from when the centre is the body they orbit. However, for permanent LOS purposes we must assume the centre is the other ancient site. From the sight of the other ancient site, a tidally locked body still rotates and always faces a different direction towards the ancient site. For a permanent line of sight the poles of a target planet would need to point towards another ancient site and the ancient site would need to be near the poles. But since on the alpha ancient site the site is not near one of the poles and the stars above the ancient site always change, there can't be a permanent LOS, at least not from this ancient site.