Turn your focus to Deuteronomy 27:9-10. We can see here that the Israelites were learning from an oral presentation, even though it would be written down as well. They were going to be responsible to listen well and remember, passing on what they heard and knew.
I’m coming to agree with the idea that Deuteronomy may have been the first book of the Pentateuch written, at least in basic form. Then the rest was written/dictated by Moses to fill out all that occurred. At the very least, it should not be seen as a second telling like we normally call it. Most likely, Deuteronomy is the compact form of the Law for the people, with the finer points explained in Leviticus and Numbers for teaching and administration. Much like our legal system: murder is illegal. Everyone should know that. How does the statute describe murder? Much more in-depth. What do I need to know? That murder is illegal, but my lawyer may need more information.