This related question asks if you could transcribe a ritual spell to the warlock book via the Book of Ancient Secrets invocation regardless of spell lists, and the answers were generally "yes, but you can't tell what the spell is".
This other one asks if you had the Eyes of the Rune Keeper invocation, "could you cast a scroll of a spell outside of your spell list?", and the answer, using a quote from Crawford, was that you cannot cast the spell since it was out of your spell list (but it did not state if you could actually read the scroll).
By this point, you can probably guess where I'm getting at.
The description of the Warlock eldritch invocation, Eyes of the Rune Keeper:
You can read all writing. You can comprehend any written word or symbol, should it hold any linguistic meaning.
The rules on scrolls outside of your spell list:
If the spell is on your class’s spell list, you can read the scroll and cast its spell without providing any material Components. Otherwise, the scroll is unintelligible.
Can I understand magical literature that is normally outside of my class list if I have the Eyes of the Rune Keeper?
What would I be able to identify from a written spell with Eyes of the Rune Keeper?
Note: I am not asking if I can cast spells outside of my class with the invocation; I am asking if I can understand the nature of the scroll/spell, even if I can't cast from it.