Thanks, Carr, interesting link.

A few points that immediately seem relevant are:

1. The fact that the circulating light beam can be seen to be causing a neutron to circulate does not necessarily prove that spacetime is being "twisted".

2. Dr Mallett seems to jump from arguing that one might be able to travel forward through time, to saying that past-directed time travel is possible. This assumption is not completely justified.

3. The introduction indicates that Dr Mallett is considering going back in time to save his father's life. Although the subsequent interview did not back that up, we must not lose sight of the fact that changing the past is a very contentious issue. A spacetime event cannot be changed.

There never was nothing.