The "No Generated Structures" option will still generate Dungeons, as well as Nether Fortresses in versions 1.0-1.7.10. However, some see this as being against the spirit of No Generated Structures, namely categories not being reliant on chest loot.
For example, this "Enter Nether" run sets Generate Structures to OFF, but is still able to use loot from an exposed dungeon:
Thus, we have decided to host a poll to decide whether we should allow accessing Dungeons and Nether Fortresses in the "No Generated Structures" category: https://www.strawpoll.me/18521937
The ruling has been decided long ago, but just for clarification, accessing Dungeons and Nether Fortresses in the "No Generated Structures" category is not allowed.
Submissions for Category Extensions must now follow the same standards of showing F3 asked of main board runs - showing the title screen will no longer be considered verifiable going forwards.