The 1961 published photo in the Survey of Megalithic Tombs shows no hazel scrub and way less vegetation. This is looking at the north side of the tomb.
Image credit: ryaner
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Ah, I do like that....
It is nice, but check the shot in this pdf for comparison: webservices.archaeology.ie/arcgis/rest/services/NM/NationalMonuments/MapServer/0/1724/attachments/1290