Given that GB won't exist other than geographically, is this surprising? Also the article is so short it gives you no clues as to how he would vote were he able to. Listening to debates is indicative of nothing other than an interest in what's going on.
I don't read very much into it all, to be honest. Lots of folk might say he's been playing like he was a true Scot since he came back from surgery, of course, and they probably will now!