As far as being a attacker, being inexperienced matter not so much, as long as they have the confidence to take on the defenders. Chongs talent is undeniable, the only thing he is missing is regular first team football. He has been training regularly with the first team all of 2019, the fact that he did not get loaned out this summer should be a sign of how highly the coaching staff at the club rates Chong.
And just for the the record: Martial, Rashford, Lingard, James, Greenwood, Mata and Andreas are all ahead of Chong in the queue to first team football. Defensively Dalot will also play ahead of Chong on the RW.