It doesn't say "good Portuguese" Bom?
It says but it's not part of his quote. Look:
“Bom dia a todos, é um prazer estar no Rio. Obrigado”, disse o tenista número um do mundo, Novak Djokovic, em bom português.
"Good morning everyone, it's a pleasure to be here in rio. Thank you", said the number 1 tennis player in the world, Novak Djoko, in good portuguese
Nole didn't say it, it's the journalist.