I think the complete opposite.
At his age, this could be the form of his career. A move China would be for players towards the end of their career looking for the final payday who perhaps haven't got the legs in our game but in theirs they can still be that flagship elsewhere.
After two, three years in China where does he go from there?
But he could go to someone in the prem do very little and end up back at a championship club on the bench.
If he was 21 I would say no he would be stupid but he's 27, if he ever really going to get a contract on £100k a week! That's a lot of money even if he only does a year out there and he will have offers over here when he comes back.