I used the term "Holy Grail Vortex" because I saw it in a few peoples websites and videos.
I would imagine it has to do with the myth that the cup that Jesus drank from at the last supper was transported to France.
One of the problems (among many) with people who expound on these "theories" are that they lack a true understanding of history and myth.
First, for Bible believers, there is no scripture that places importance on said cup. The myths that have arisen from the grail are, at best, pseudographical in nature--an afterthought by much later writers. The idea of the grail is primarily associated with the legend/myth of Arthur. In fact, the grail didn't enter written accounts until circa 1200 CE--which is a LONG time after Jesus reportedly lived.
Why would a vortex by represented by a REALLY iffy "holy" cup?
It just doesn't make sense--oh, wait, to people who buy into this . . . never mind.