The Romish doctrine of transubstantiation (local presence under each species, worship of the host, etc) is nowhere to be found in these comments.
Exactly. Romanists read the church fathers and project their own prejudices into the material.
Many church fathers, Calvin included, spoke of the "real presence" of Christ, meaning Christ is "really present" spiritually.
Physically, Christ, "the lamb slain from the foundation of the world," is in heaven sitting next to the Father having completed His task of justifying His sheep.