Richard,

[...]
No, it hasn´t. SR forbids *transport of energy-momentum at
superluminal speeds*, and in the case of anomalous dispersion, as in
this experiment, energy-momentum is not transported with the group
velocity of the wave package. So superluminal group velocities don´t
violate SR.

Where in the lorentz transform is it implicit that v corresponds only to
tangible particles?

Where did I say this?

You are only repeating what you've heard over and
over. This was an outright lie imposed in order to save SR from very
observable superluminal speeds.

You will have to prove this.

It was a rationalization, it was a
fabrication, it was pulled out of their asses.

You should avoid such vocabulary if you want further discussion.

Tell me, If a spot
(generated by a rotating laser) is moving at 2c along a fence wrt me,
then what speed will that spot be moving wrt an observer moving at x m/s
wrt the fence, as measured by that observer?

Tell me why do you think that your light spot is transporting
energy-momentum along the fence at superluminal speed. Energy-momentum
in this example is only transported from the light source to the fence
with speed c.

regards,
Jürgen