That's the minimum level to be able to read something and actually pick out useful information, without someone tailoring the text for your exact situation. Which is the entire point of books, and reading in general.
I'd argue if you can't read something and make use of the information in the text, you are functionally illiterate. You may be able to read signs, you may be able to read basic instructions with guidance, but you can't actually read without assistance. Being unable to actually make use of a text and learn from it is illiteracy.
That's the minimum level to be able to read something and actually pick out useful information, without someone tailoring the text for your exact situation. Which is the entire point of books, and reading in general.
I'd argue if you can't read something and make use of the information in the text, you are functionally illiterate. You may be able to read signs, you may be able to read basic instructions with guidance, but you can't actually read without assistance. Being unable to actually make use of a text and learn from it is illiteracy.