Hello, Sola. Again, I must state the obvious.
Theopneustos means God-breathed with regard to Scripture. Scripture is God-breathed. Amen. But whether or not
theopneustos occurs once in Scripture or not, does not create the word “only” in the text. 2 Tim 3:16 is an affirmative statement, not an exclusionary one: A is B. It does not mean nothing else is divinely inspired. Such a claim is simply not there.
Take this for instance. Mary is called
kekaritomene in Luke 1:28, the only occurrence of this perfect-passive-participle, literally “having been perfected in grace” (a full treatment
here). Are we then to conclude Jesus was not perfected in grace? Only Mary because it is the only occurrence of
kekaritomene in Scripture? Of course not. (FYI, even if you don’t accept a “Catholic” translation of
kekaritomene, you can translate the word any way you want too: “full of grace”, “highly favored”, “favored one,” pick your translation…the point remains the same.)
p.s. the broken link you mentioned works fine for me.
p.s.s. Speaking of what contains the breath of God, don’t forget
John 20:22 and go on to verse 23 while you’re at it…
God bless.