These photos of the cairn at Maen Penddu are fantastic, but are they actually the cairn?

On this web page, "Tal y Fan - A Lost Community", there are photographs and a description of the same site, but here it's described as a Peat House dating from the Middle Ages...

http://www.welshvilla.co.uk/tal_y_fan.htm

The only cairn I can see on Coflein (SH73847359) is described as, "a turf and heather covered cairn 7m diameter and 5m high with a slight depression at its centre". This doesn't seem to fit the photos on TMA.

If Caealun's not about, can anyone else shed some light on this?

K x