I have read the article. I offer a couple comments.
Evangelical Lutheran Worship includes all 150 psalms. The introduction says of them: "The 150 psalms presented here use a version intended for common sung prayer and proclamation, rather than a translation for study" (p. 335). Thus, the translation shouldn't be used for study. I think that in a similar way, Lutheran Service Book adds the Gloria Patri to the end of every psalm; pointed for chanting like the rest of the psalm. That addition is not a translation, but meant to aid the worshipers in singing the psalms in worship.
One issue I have with the essay is his downplaying of Hermann Gunkel's genres in the quote below:
Hermann Gunkel, the ringleader of form criticism, proposed five genres: hymns, individual laments, individual thanksgivings, communal laments, and royal (enthronement) Psalms.1 There is much absurdity in Gunkel’s “phantastic” suggestions—why invent religious ceremonies for early Israel when the Old Testament itself provides plenty to choose from? His offhand rejection of their historical roots in the lives of the Old Testament saints is pure whimsy. (pp. 125-6, boldface added)
1See Hummel, The Word Becoming Flesh, 421–425
Yet, later in the essay, he uses Gunkel's genres in talking about psalms!
Among them are the “Psalms of lament.” In the first two books of the Psalms, at least, the Psalms of lament significantly outnumber the Psalms of thanksgiving. There are perhaps forty in all, forming the very “backbone of the Psalter.”2 (p. 128)
2Hummel, The Word Becoming Flesh, 428.
I have not found that Gunkel's genres have anything to do with "religious ceremonies," but center on the common outlines and content of the different genres; as he writes about the genres in the second quote.