[gnaritas]

Mathmatically compatible with GR (which is known to be incomplete) doesn't mean possible in reality, in fact, read your own source, it makes that clear..

> Although the metric proposed by Alcubierre is mathematically valid (in that the proposal is consistent with the Einstein field equations), it may not be physically meaningful, in which case a drive will not be possible.

That drive is nothing more than speculative science fiction.