It would be illegal for them to withhold those benefits in those stores that have an active union campaign, but that's not what they are doing.

I'm fairly confident in this (I was a union organizer who has gone through an NLRB election), but do you have any precedent suggesting otherwise?

> So this is illegal for any of the stores that are currently in the progress of it, but have not yet committed to it.

The article says only the store that is unionized isn't getting the benefit. What am I missing here?

It’s the threat that if you unionize you won’t get these benefits.