I see this pop up a lot.. you know LeBron was trying to highlight how bad some of the players were playing that day.
Akin to saying "my grandmother could do better", one is not saying their grandmother is uncle drew with this expression, it's a way to express how bad the NBA players looked.
Bronny was not the best player on his high school team at the time. Yes he's boosting his son but mostly this was a jab at the basketball he was watching.