It means that the claim is struck out. However, the judge has thrown the claimant a lifeline by allowing them to submit further PoC to be received by the court no later than 4pm on Friday 16th May. If they fail to do so, the claim is struck out again.
However, if they do submit further PoC by the deadline, you then have until 4pm on Friday 30th May to submit an amended defence.
So, for now, we wait and see whether they submit further PoC or discontinue. Either way, you either win or get a second stab at defending.