He is not he is saying that at the time of the Scots ref they were promised they could stay in the union and the eu . Fact
However since then ( as things move on) there has been a referendum and leave the eu won in the uk . Fact.
That does change things and the snp are using that change as a means of canvassing a new referendum on leaving those nasty English.
That’s it. Do it. Have one. Things will change if we leave the eu but as I say that is entirely for the Scots. Circumstances will have changed.
If it means I don’t have to listen to the acceptable face of xenophobia, which is shouting anti English crap whilst wearing a suit , then it’s another brexit dividend for me.