I am entirely sure of all the reasons and there would no doubt be some that are not immediately clear, but the Templars themselves, according to Culling in Sex Magick, were learned in the ways of this secret art - whether or not this is true, the mythos and secrets have continued. of course, also if he was in the Gnostic mass collects in its 19th century form, if it existed then, this would of course have much to do with that freemasonry and the similar orders looked to de Molay and Templars - with legends created of de Molay passing on secret wisdom.