Well, yes. Dimaria said it herself. Natsu was able to move through Chronos' time because END's power was greater than that of a god. There was no special "anti-time" property that END possessed. It was simply at a level of raw power that surpassed what Chronos was able to affect. If Natsu has a power greater than END's power, which he does, then it stands to reason he can move through Dimaria's time just fine. Natsu has enough raw power to overpower Zeref using Fairy Heart to power his space-time magic, which is a level of time manipulation greater than Dimaria's. Zeref can manipulate time to such an extent that even when Natsu incinerated his body, Zeref rewinded time to re-assembled his body. I'm not sure why you put gods on such a high pedestal. Natsu already defeated the God of War, so it's not like beating gods is anything new. You can call it bad writing if you want, but that doesn't change the fact that I'm right.
Wall and Dimaria are not on Natsu's level either, so I don't see what they can or cannot do scales to Natsu. Acnologia was stopped by the magic power of everyone on the continent. Even then, this only provided Natsu with the opportunity to use all the dragon slayer's power to defeat his spirit. It was a combined effort that took him down. Without Lucy using Fairy Sphere to seal Acnologia's physical body, Acnologia's spirit never would have been weakened. Without Natsu destroying the spirit, Acnologia would have eventually escaped Fairy Sphere.
A dragon slayer wields the same magical powers as a dragon slayer. The inability to dragonize just means Natsu will never have the physical toughness and strength of a dragon. Secondly, not all dragons are on the same level. Natsu may never have power on the level of Igneel or Acnologia, but he can certainly beat some of the GMG dragons. You don't need to be as strong as a top tier dragon to be stronger than a god. Irene is not on Acnologia's level, yet she is already way stronger than Dimaria. Natsu doesn't need to be as strong as Igneel to move in Dimaria's time. He just needs magic as powerful as END's power. Which he obviously has, unless you want to argue Natsu's feats as END are better than his feats against Zeref and Acno.