There has been progress, no doubt. However, just a few days ago, the (Danish) commentators said how much is missing in terms of speed, attack, accurary and so on. The same commentators said that VA was absolutely untouchable (this is a quote) at the moment. So when Momota loses it is convenient to say how bad he is and how he's never getting back and so on, but when he's up 22-20 and 17-14 against the "untouchable", he's suddenly, in the matter of two days, "back to his best", simply because people don't want to say VA is only winning narrowly against a bad version of KM.
And as far as "almost no errors" is concerned, I'd say he let like 8-9 shots drop that he easily could have played but misjudged on.
What's certain is that we'll hopefully get to enjoy more matches between these two in the future and that with KM getting better gradually, we might see even higher levels of play.