Article is poorly titled and misleading - no official decision has been announced on this (but I'd bet on it happening). From the article:
In the meantime we can expect United to remove seats from regional jets to comply with their pilots contract as they move to furlough large numbers of employees effective October 1.
No duh. They're making plans to remove 6 seats. That is one row of coach seats.
The seats are all on a track system. It's probably not that hard to remove one row of seats and move the rest of the coach seats to give a bit more legroom.