Those statements do not contradict each other directly, but it's very clear that a commodity is not its own use-value, nor is a commodity its own exchange-value. Use-value is very clearly meant to be the property of a commodity to satisfy a need, and exchange-value is meant to be a property of a commodity to be exchanged for something in a given context. That obviously makes use-value and exchange-value in the latter senses not synonymous with the term 'commodity', nor with each other.