I remember back in the 80's when teh WTF exploded all around the world, and since then their rules have changed about as much Michael Jackson changes his appearance. I used to compete in WTF tournaments event though I am a Kenpo practioner, and I noticed the bias very quickly. They hated my black uniform, they hated my kata, especially when I won. and they really hated it in sparring when I would knock over my opponent with a solid punch to the chest.
Over the years I saw the WTF tournament scene change, Sparring became the only thing important. Forms competition was rushed, childrens, and under belts were rushed just so they could get to the Black Belt sparring. They missed the point that the the under belts and the children are the future of the art and that they need to be showcased as much if not more than anyting else at the tournament.
As for blocking in TKD tournaments, I haven't seen much of it. And the noises are really discouraged. If your friend is attending a WTF event he should be ready to follow the rules set forth by the tournament host to the letter, or he will end up wasting his money.