Granted I haven't been keeping up his more recent news, but I know where you're getting at. I do agree his English is articulate and good. But his last interview that was in English, I saw was on one of his movies. I can't remember which one, but I used to see it online somewhere and his English then was articulate but there were times where he couldn't find the right words.
It happened to me, except in my case, it's hard for me to converse with my friend in Cantonese since I haven't spoken it for a few months so I can't find the right words and end up repeating myself a little.