Hypocrite, IMHO.
As pointed out by the MP in one of the other links in the link:
"He should reconsider who his paymasters are or move elsewhere so there isn't a problem," Mr Campbell told the Belfast Telegraph
"He needs to keep his head down and play football, but what he shouldn't do while earning money from the UK is set himself up as a controversial pseudo-political figure, which is what he's doing."
Seems fair. If he feels the need to turn his back whilst the national anthem is being played he ought to reconsider where he plays his football and for whom.