if you drop the passive aggressiveness for a second, you will see that Subadim was saying that Sutch is still in Cyrodiil at the time of Oblivion, and was not shown simply due to gameplay. Thats lore inasmuch that Sutch still exists. He was also calling the retconing silly, not your question for lore.
Is that what he meant? Because the way I read it, he was making an implied comparison between the two of us by talking about himself in the superior, calling himself smart enough to see something he thought I'd missed, and then saying that he didn't need explanations, like the ones for which I was searching, for the content in his game and to look for them was silly.
Re-reading it, I can see both interpretations and a few more. He wasn't very clear was he?
@Subadim, if you indeed were posting constructive arguments about lore, then I apologize. To me, it seemed that you were talking down to me and calling me not-smart and silly. So if there was a mix-up lost in translation, then I apologize.
As pointed out earlier, all we really know about Sutch is that is at least in part a military installation that has changed hands a couple of times :shrug: our maps represent a very, very, very narrow timeset, and hence the lack of Sutch on any map of hammerfell doesn't mean that it never was in the province.
I would love your source on the military installation bit. The only thing I can find in lore that supports that is the mention by a http://www.imperial-library.info/obscure_text/forum.shtml of the possible presence of imperial soldiers in the city who could help apprehend a fugitive, and that's only if the Dragon in the quote refers to a group of imperial soldiers.
As for the physical location of Sutch, it is shown to be in Colovia near Anvil and Kvatch on several maps, including the redguard one published by gamesas. However I have never found a map with Sutch shown in Hammerfell. I am leaning towards the moving borders story in which the city stays where it is, and the border moves over the city. Thus on an older map with the border in a different location, Sutch would be in the same location, yet in Hammerfell. I've even scoured the timeline for points where the border could move, and while doing so, I tried to imagine how the map would have looked in each era. As stated in earlier posts, I believe the most likely times are 1E 1029 and during the rule of Talos.
It would be much easier to pinpoint if I could find the date that the thieves guild was wiped out. Thief of Virtue is set in Sutch, in Hammerfell, 450 years after that event.