EU referendum, brexit and the aftermath

So does this mean a hard border on the Irish sea ?

Ignoring the DUP, that's what it looks like. But that still raises complications:

Experts in Belfast say the reported deal raises difficult questions about government in Northern Ireland.

“How do you define regulatory alignment? Who is going to oversee it? What kind of dispute resolution mechanism is there? Is this going to be the responsibility of the devolved government and, if there isn’t an assembly, is it the responsibility of London and Dublin?,” asked David Phinnemore, professor of European policy at Queen’s University.

Unlike countries in the European Economic Area, which automatically adopt European law, regulatory alignment suggested that a decision would have to be taken in the UK to make sure that parallel adoption of laws, he added.

Phinnemore said it was important to see the other wording in the 15-page document relating to non-trade issues and the 142 areas on North-South co-operation identified by Britain and the EU as being impacted by Brexit.