In Derech Hashem, he writes straight out that everything that it says there, the tree, fruit, and eating, were physical happenings.
T’was quite a while since I went through the Daas Tvunos, but the Ramchal does say that the world was more Ruchniusdic. That doesn’t mean it was less physical. It means that the world was closely connected to its purpose, and when you looked at an object its Ruchnius aspect was very clear and shone through it.