Yeah, I assumed that they handed over the phase cloak technology to the Romulans after that incident anyway.
Well, we don't see what happens, but I would have assumed that the Romulans would have demanded the technology right their on the spot in order to keep the treaty intact. I suppose Geordi or someone could have purposefully sabotaged it before handing it over.
Of course, since they introduced Section 31 and they were willing to commit mass genocide, it seems silly that there wouldn't be at least one Section 31 ship phase cloaking all over the place.
I'm sort of interested in that Section 31 comic with Bashir they're coming out of, because it sort of looks like what I expected would ultimately happen to Bashier--he'd be a bitter outcast if he decided to wage a one-man war against 31.
The Section 31 books that each took place in a different Star Trek era were also really good from what I recall.