Isn't that the exact opposite? That sounds like reasons why "understood" may include false positives ("you understood all words but not a necessary grammar construction or couldn't follow at the given speaking speed"). It mentions "context" but the context in which context is mentioned suggests it's meant as yet another hurdle, not as something that could help.
Grammar is very important. You can understand all the words and not know if the super robots power the spaceship or the spaceship powers the super robots. And I remember some translators getting that particular point wrong because the anime's lore made the super robots work in strange ways.
>What could make this wrong: >1. "Understood" means you know every word. It ignores grammar, kanji readings, speaking speed and context.