At least they can't cloak ambush you, but a vaper build will be non defensible against anyway.
I guess you didn't read carefully...
By reverse-engineering the Undine biotechnology used in their ships and weaponry, the forces battling this threat have gained a much greater understanding of their ability to shift between Fluidic Space, and known space. This knowledge has resulted in being able to use another piece of salvaged Undine biotechnology – the Fluidic Phase Decoupler – on any existing ship.
This unique Console allows the ship to briefly decouple itself from our phase of reality, becoming perfectly invisible for a brief duration at the cost of their ship becoming slightly more difficult to control due to increased turn rate, and a major decrease of inertia rating. Upon re-emerging into our phase of existence, the ship releases a large bioplasmic shockwave that will damage enemies close enough to be caught in the blast. The shockwave also leaves a lingering debuff that will slow enemies hit by it.