The exposition in these kinds of works is terrible. He is by himself with knowledge he already has but is giving a soft 4th wall break to explain to us the readers what he already knows and out loud as well. If you have to write it like that you are making things too complicated.
Now this is an in general for this genre but applies to this title as well. It feels like the people that write this really wanted to work on developing video game RPGs but got turned away by developers. When that happened they figured they would try their hand as writing LN/WN or manga/wha/uha. What we end up with are unnecessarily complicated skill systems and pages of blue wall status screens every time the MCs picks up an item or learn a new skill. It would be better if they posted that and any technical stuff at the beginning or end of a chapter and let the chapter itself be story not the game mechanics.