Of all the issues traditionally listed as causes of tailing loops that one above is astonishing. And even more astonishing taking into account that you can simply rig your rod and try its validity for yourself.
A tailing loop is a transverse wave traveling along the fly line, generated by a sudden down-up motion of the rod tip during the casting stroke.
Copy&Paste from Tim’s comment:
“But Aitor I would have to argue that in that video you are not breaking the 180 rule as you are allowing the line to fall enough to then afford an upward trajectory…”
This is a screenshot from the video above showing the position of the line just after the start of the forward cast:
For more insights into tailing loops: