Perhaps your failure to comprehend why it is an irrelevance stems from your inability apparently to separate domestic and international affairs, politics and policy. But for your benefit Backwards here is a brief summary of what has happened:

Pre-election the EU was ("supposed to be") negotiating the UK's departure from the EU with the British Government ( For Shaw's benefit - That will occur on the 29th March 2019), that British Government was a Conservative Government led by Theresa May.

Post- election the EU finds itself ("supposedly") negotiating the UK's departure from the EU with the British Government ( For Shaw's benefit - That will occur on the 29th March 2019), that British Government is a Conservative Government led by Theresa May.