That's a brilliant move by von der Leyen and Mark Carney (I guess he's in on it as well). There is currently no such status as "associate member" defined in the EU treates although the idea of special status for not being a complete member was floating around for a while now. Just calling it a "unique alliance" or "deepening of their relationship" wouldn't have had such a public effect. Half of the right wing influen…
The only bit the EU is rowing back is that they mentioned during BRExit that there would be no more custom deals so this simply a case of the realpolitik winning out.
I'm sure the UK will be looking at this very carefully as well.