TBC is a car park/office building which contains the engine workshop and composite shop along with the training school - not aircraft.
The photo shows more than the usual number of Airbus aircraft parked (non stike days 2-3 normally) during the strike day but many less than at the start of the strikes showing that more flights were running as the strike went on.
Around the back of TBA there is space for another 6 or so aircraft to park. 4 of these spots are taken by 757's which are under storage awaiting transfer to their new owners. The rest of the 757 fleet were bunched up there during the strikes but not sure on this particular date.
Of the remaining spaces, TBA and TBJ are normally pretty full with aircraft undergoing maintenance and TBK is out of action being reworked to accept the 777-300's.
All that photo does is prove there were several Airbus aircraft parked on the TE stands during the strikes showing that BA's already announced reduction in shorthaul flights was probably accurate.
Hope that clears things up a bit.