I think he just hasn't provided your (and others') interpretations of continuity.
I think what GLS meant was, having someone who would be working ahead, scouting players, identifying targets two or three windows in advance, and making sure that we suffer less when managers leave. A number of factors interrupted our progress in the summer: our precarious league position and Kearney leaving being top of the list.
It stands to reason that, no matter what, transfer activity will be stunted by those. Since then, we've done some very promising transfer business, a lot of it on two year contracts. So from that perspective, he has succeeded.
I'll bet we had a damn sight more continuity in terms of transfer activity Vs when Ross left, too, and it's clearly left us in a better position compared to this time last year.
Yes, you're right: if you're looking at a tiny portion of our long term plans, and refusing to look at other factors or subsequent successes, and refusing to compare our situation to last year, then Gus failed.
But by any rational measure, and bearing in mind his job is far from over, then he's doing very well.
Edit for TL;Dr - just because we didn't sign players early in a single summer window, doesn't mean continuity hasn't been provided