Mentioned it in his speech afterwards, no?
From the Shadow Brexit Secretary too:
Every step of the way Labour has sought to put the national interest first and to build a national consensus around our future relationship with the EU – not as members, but as partners.
That is why Labour did not frustrate the article 50 process in parliament. It is why Labour has set six tests for the final Brexit deal that would deliver the best possible deal for everyone in Britain, whether they voted remain or leave.
This general election is a result of the prime minister’s failure to build a national consensus. It is also an opportunity for Labour to set out an inclusive, progressive and ambitious future for Britain.