You are still caught up in the inexact popular usage of 'symbol'. Remember, this comes from an academic text.
Lutheranism believes in a Sacramental Union. This implies a differentiation between the material and spiritual plains, the acts of which are in union during the Eucharist.
Ok, I think I understand where you are coming from now. It might appears that way from the Reformed perspective, I suppose. We believe we are putting the actual, resurrected body of Christ into our hands and mouths. That's the real difference between the Lutheran and Reformed perspectives. The physical act of eating and drinking the Sacrament is what we emphasize. But you are correct there is still a certain distinction of the sacramental sign from what they signify - we just don't regard that in a nominalist sort of sense, I suppose, where the sign and the thing they signify are radically separated. That's one reason among many, for instance, why we don't really reject the veneration of icons and holy symbols (we had an adoration of the Cross on Good Friday, in fact).
If what you suggest is true, though, it would make Christ's resurrected body "spiritual" in nature as well (in contradistinction to somebody like the Rev. N.T. Wright, who seems to balk at such a notion). Perhaps there is some merit to this notion, though, at least in terms of fitting our notions into modern idiom. The Anglican 39 Articles are perhaps vague enough to accommodate both the Lutheran and Reformed perspectives, perhaps (some say that was intentional).
It also would imply that resurrected bodies are more like what C.S. Lewis said they were, and one of the reasons he disagreed so much with Tolkein about cremation. Indeed, at Marburg in 1529, Luther seemed to have gone in that direction himself, when he protested to Zwingli that Christ's resurrected body was supernatural and not limited in the usual sense we understand bodies to be.
The Presence is 'In, around, etc.' which intimates a different level of reality.
Yes, I think you are correct, here. It would seem to be consistent with the fact that many historians have said that Luther was a Neo-Platonist of sorts, in contradistinction to the prevailing views of Aristotle. This sounds strange to many modern Evangelicals of course, but that's only because they aren't aware of Luther's worldview being so different from their own.
Catholicism makes no such differentiation, with the very essence and substance of the Eucharist being indivisible from its spiritual action.
As Protopresbyter Alexander Schmemann said in his book,
For the Life of the World, it really does abolish the notion of sacrament altogether, and has serious implications for Catholic spirituality. Life as such, cannot participate in divinity without first being changed into something else. But I think the Orthodox and Lutheran emphasis is that life is in some sense already divine and merely awaits us to awaken to that in Christ (and here we could echo some of the mysticism of Paul about the Cosmic Christ that fills all things with himself).
Lutheranism is thus an example of Symbolic representation here, as opposed to the allegoric of Transsubstantiation and Catholic ideas and such. The Catholic was fully allegorical, and Lutheranism made a differentiation here that perhaps did not conceptually exist before. This is the original Protestant act, severing the Mediaeval unity of the Eucharist into material and spiritual aspects, which Reformed Churches made complete in Idealising the Eucharist fully. That it retains a Real Presence or presumed efficacy is immaterial to whether it is Symbolic representation or not.
Maybe your experience of the Reformed tradition is different but I found American Reformed Protestants, influenced so much by Princeton theologians, to be presenting something more like "This is a commemoration of Christ's death, this is merely bread and wine, and you are suppossed to remember he died for you". There's nothing really all that "Numinous" about it (what Rudolf Otto was talking about in his
The Idea of the Holy), it's strictly a mental exercise of commemoration, "the Real Absence" would be a better description, honestly.
My pastor has talked about an experience of something like what Otto was describing, presiding at the altar. That idea seems completely foreign to most American evangelicals. They happily take the leftover bread and wine and sweep it into a dustbin, and it means nothing to them. There's no sense of the
mysterium tremendum that made Luther feel real fear at his first mass, the same thing my own pastor experienced.