The extra services added are Saturday afternoon and Sunday mornings for which Flybe could request the remedy slots from BA. They had no obligation to do so, but having requested and been given them, they now have to use them.
There is still no sign of what the former Newquay slots will be used for at LHR.
I think the financial impact of limited new weekend LHR services will pale into insignificance when set against some of the other stuff going on. Slowdown in bookings, a crazy launch of LUX-LCY with rock bottom fares at only a few weeks notice, same for NQY-AMS and then EasyJet appearing on BHX-GLA/EDI will all be rather more damaging.