-
could you explain what makes this such an awful bike please?
It's not awful, it's just aesthetically challenged. You correctly spotted that tanwalls on carbon rims always look rank, but the paint scheme just makes them look even worse by drawing attention to the colour problem. As I've said before, with a nod to Susan Sontag, the apotheosis of anti is that the most serious effort has been put into the things which fail most spectacularly.
The fact that it's exactly those features where the builder has gone out of his way to be distinctive which have gone so wrong is what puts it firmly in the anti-porn realm.