I think the discovery is not the alignment itself, but the fact that there's been found some paintings and a small dolmen in the place where Menga and El Romeral are pointing at.

"I can't work out why the mountain (Peña de los Enamorados) is so called - The Lovers."

You can find why here: http://ceres.ugr.es/~jlpc/turismo/norte_ingles.html