Take it easy. It's literally written in the subclass description. "Your patron may not be aware of your existence at all." I like to think of it like creating a YouTube channel. You just press a button and the rest is up to you. At the same time, Google is a giant corporation and Google's board of directors is unaware of your existence.
And this has nothing to do with the discussion at all. Whether the patron is aware of your existence is not related to how the magic works and it does not change the fact the power is given, not learned. Whether something as the great old one does it subconsciously or through a more generic feeling of intent does not change the fact it is given.
D&D rules for learning of magic are VERY specific...it involves having a spell book and you need to write spells on high quality paper with ink. The warlock does not do any of that, nor is the warlock required to have even average intelligence or any innate ability to use magic as Sorcerers do. Warlock magic is given to them, not learned.
