We are dealing with a number of systems built up over years, the latest being the Openreach waiting list. It is highly likely that most systems outside Openreach are updated at set intervals, almost certainly not in real-time.
It is quite possible the Openreach in-house waiting list is either being notified in real-time or checks very frequently. It is (theoretically) easy in the Openreach system to ensure it gets first stab at any particular cabinet that opens up a slot.
A the time the Pulse8 checker, which is probably the TBB checker, which checks whatever it is that feeds all the public checkers such as the BT Wholesale and BT Consumer ones, which could well be reading at intervals a file of new available/non-available cabinets, the in-house Openreach waiting list will have been notified in near real-time. That one will automatically get the slot and the others will update saying available using a feed that is already out-of-date.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
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