The meaning of Pratyabhijna simply is self-recognition.
How can you recognise a person or place?
Only if you have been with him or that place before.
Have you been with Shiva before, of course, yes. In Malinivijyottara tantra Shiva explains to devi: Since we have been there before we can recognise it.
In fact, throughout the world, all enlightened or self-realised masters will say they have not gained anything special but realised that which they already are. It's a feeling of coming back home after a long journey or waking up from a dream of the world. Nothing gained.
But you lose the unnecessary conditioning, the load you keep on carrying one life to another life. You break the bondage of Puryashtaka.