Yes, because Paul was only in the first century.
Throughout the early Church, as doctrine becomes more and more defined, there are ways of describing doctrines that sometimes become obsolete.
For example, while early Christians sometimes referred to the Eucharistic elements as “signs,” all the while fully believing in the substantial Real Presence of Christ in the Eucharist, it became necessary to no longer use the words “signs” because of later controversies and clarifications.
This happens in the history of doctrinal development all the time. Christology especially in the early days.
So re: Paul – he calls the Body and Blood “bread and wine” in the apparent sense. He’s not offering an intricate theological treatise.