On the one hand, some things make it look like he did something of great significance there. (Which is why this subthread is happening at all.)

On the other hand, ch.92 seems to show Harry, from his own point of view, at least convinced that Hermione is lost-and-gone-for-ever and that there's nothing he can do about it. Which means that either Eliezer is deceiving his readers in ways I think he wouldn't, or Harry has managed to memory-charm himself, or he hasn't done anything that (from his own perspective) gives a substantial chance of saving or recovering her. The first two of those three options seem pretty unlikely to me.