On the pledge part of the FoH site, it says the current date for DDs will be 2nd Aug with the caveat that if they are still in negotiations then "an appropriate date will be decided".
It looks like the timing is down to the minimum 3 working days notification under the DD guarantee scheme.
I don't think there is much to be read into the timing at this point unfortunately, the pledgers agree to pay any refund costs so they are covered that way as well.
It makes the decision not to take the payments strange to me.
I'm not arguing they may know the game's up for the current bid, just I don't see this as an indication of it.