Perhaps someone more knowledgeable can enlighten me... if the provision has already been approved, how can the White House change the wording? I thought the President wasn't able to make modifications to legislation.
Yeah, it's weird they left that detail out, but I assume they mean the administration will have someone take it out during conference committee. There is also a time after a bill has been passed by both houses (but before the president signs it) where corrections can be made to the bill. These are only supposed to be typographical corrections that don't change the meaning, but...
The bill is in conference committee because they passed two different bills. They have to try to craft a bill that synthesizes the two and (crucially given the filibuster) that can pass both houses.
It's not a line-item veto. That wiki page mentions it has not become law. As far as I can tell, the bill is in committee. Both the House and Senate have to vote on the exact same bill. But both houses like to make their own changes. So each pass their own version of the bill, then meet in committee to come up with a version they both agree on, this new one goes back to both houses and they pass it. What I suspect is being claimed is that it says "shareholders" in both the House and Senate versions that already passed, and the White House is asking the committee to change that to "shareholder", otherwise Obama will veto it.
I did remember that the '96 act was axed by the court, but I wasn't aware of the more recent versions. I suppose this story is a perfect demonstration of why this kind of thing is a bad idea