I can provide you examples of dialogues from linked fragments.
Skyrim - Voices_en0.bsa -> sound\voice\skyrim.esm\maleoldgrumpy
I don't know how it is with other dialogues from ICAO, but those are legit cut content. It isn't spliced dialogues from other lines.
As for OCW im in contact with it's creator and im not sure if he has ambition to restore more cut content. He is rather conservative about making it as conflict-free as possible and avoiding editions of vanilla files and thus avoiding conflicts with USSEP and CRF or any other mod. So most of CWO stuff is outside of OCW's scope for now. OCW is really more about wargame map than about cut content, altough restored city battles are nice addition to it.
EDIT: Thanks to SimTam i managed to find that those dialogues are in fact written and in game, here are their ID's in SSEEdit
EDIT2: i looked over Shurah's IC example videos and checked if the scenes are noted on UESP. Altough i do not trust wiki's blindly, i presume that if some scene has slight possibility to be working in game, it would be listed there. Or at least You would be aware of it's existance if it was listed on UESP.
Only four of showcased scenes appear to be cut content. One is infamous Anoriath's hunting, and three other are scenes with Vignar. All three are on screen attached. Vignar-Balgruuf, which is famously known cut content, iirc it is even restored in CRF. Two other are Olfrid-Vignar and Idolaf-Vignar that i have linked and shown proof of their existance on the attachment. They have their scene attached to them: WhiterunFeudScene1 (000E3DE3) and WhiterunFeudScene2 (000E3DE4). For some reason i have never found it ingame, and i assume that since you haven't believed it even existed - nor did you found it.
I hope i have gave you enough evidence to investigate the matter and hopefully restore it for CRF <3