He's living in Cambridge now. I read an interview last year where he talked about moving out of Germany since it was 'no longer open to other cultures'. Strangely enough his plan at the time was to move to the USA during Trump administration. Looks like he decided to move to another country under a nationalist/protectionist government to find his openness towards other cultures...
Sure, but then why wouldn't he say so? It's not like he likes Chinese government very much, so why would he present it as a racism issue? It's almost the opposite...
[0] https://en.wikipedia.org/wiki/Ai_Weiwei#Release