It's an excellent parody but of course it's the Cardiff City message board , not the Wales one.
I should think that there are actually quite a lot of Cardiff supporters who aren't Welsh. The ownership, management and playing staff certainly aren't .
What's more, I can tell you that there's a long tradition of Cardiff City fans not being very convinced about or committed to the Wales football team. I can remember a time when a lot of people used to interest themselves more in rugby for internationals and were far more interested in watching England play football than Wales.
I don't know how much the divisive politics of stuff like devolution and learned resentment has changed this, but maybe the reality is that although people feel a pressure to say they give a toss , they actually don't.