Well yes,
In those days ONLY Levites were allowed to "handle" scriptures. In order to be Barmitzvah-ed you were to recite the entire 5 books of Moses without flaws. Being poetry was obviously helpful.
But basically you could write your own copy of scriptures but not give them anyone else. You also were not allowed to recite the scriptures to anyone else either....especially a Gentile. The poetic nature helped with the poetry being an earworm.
At my Bar Mitzvah I read from what is called a "Haftarah.."
Far from the entire 5 books of the Moses.
That could mean Saturday morning service would have lasted all day if there were several Bar Mitzvah candidates for that day.
He was to recite "all the five books?" Sounds like uninformed Gentile folk lore to me.
The bar mitzvah ceremony is much shorter than what that could not allow for.
I was bar mitzvah'd. Never seen what you described, unless it takes place with Hassidic Jews.