Does Hermann Gunkel’s pioneering form-critical work on the psalms encroach on inspiration?

Hans-Joachim Kraus’s monumental work on the Psalms often refers to Hermann Gunkel’s commentary on the Psalms. In his commentary on Psalm 28,2, Kraus writes the following: “H. Gunkel suggests that we supply הביטה: ‘Look up when I lift up my hands. . . . !’” (Hans-Joachim Kraus, Psalm 1-59 (Minneapolis, MN: Crossway, 1993), p. 339). This is suggested to ‘force fit’ a certain meter for verse 2 (“two five-pulse meters”). I couldn’t find a reference anywhere regarding the inclusion of the verb ‘נבט’ (look, consider: (Hiphil)), and the Massoretic Text does not indicate any such variant reading: Basically, I’m looking for any reference of Gunkel’s to his suggested modification to this particular verse in Psalm 28. I believe there are also others examples.