Both options are correct and widely used. The phrase can be stated as either "Для него как дебютанта чемпионата мира" or "Для него как дебютанта чемпионата мира." The presence or absence of the preposition "для" does not change the meaning of the sentence.
Both options are correct and widely used. The phrase can be stated as either "Для него как дебютанта чемпионата мира" or "Для него как дебютанта чемпионата мира." The presence or absence of the preposition "для" does not change the meaning of the sentence.