There is a different, geological, basis for what constitutes a continent. And the scientific basis for that isn't entirely settled. Which is I think the point Gok is making.
This isn't universally accepted, either. The general consensus agrees with you, but Gok is alluding to the grey area here.
I'm not going to argue the merits of either side of these discussions, but yeah I think Gok was pointing to grey areas is all.