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To be able to read music you need to learn to read the notes on the staff and how they correspond to the mechanical things you need to do to produce them like, pluck the string, push the key, or blow the note, first.
And that is taught before any kid or adult knows the notes that form a diminished chord and why, or have to know that an
ASCENDING SCALE, is a peculiarity of the minor scale adopted in modern music, that its form is frequently varied by accidental chromatic alterations, to satisfy what are assumed to be the requirements of the ear; and as these alterations most commonly take place in ascending passages, it is usual, in elementary works, to give different forms of the minor scale, for ascending and descending.
You don't need to know cycle of fifths, cycle of fourths, chords, arpeggios, to read dots on paper. But if one keeps at it, they will.
Yes at first you learn the staff and the symbols used on the page to read the music but that is not music theory in itself, it is part of it though.
Matter of fact there are a lot of readers that have been reading music for years and still don't know these things. Of course IMHO