Exactly. And Nakamura takes in that video the position that 100% is the perfect game. It's not. 100% means you made exactly the same moves an engine would made, but engines sometimes have two best moves with only a minimal preference for one of them. Those decisions are the ones that made Nakamura best games "mere" 80'ish%, in less important moves he did the second bests according to the engine.

If you are a top player and cheat, you would only require a couple of decisions here an there in complex positions, and the games would be still at roughly 75%. But if you don't fully understand the line, or you're not in the zone, and the engine suggest something crazy (but winner) you need all the following moves.