This video makes it less likely the pool deck collapse was the starting point of the failure.
That video’s highly emotional too...
if you turn on the sound it’ll hit you hard if you understand the language. That looked like a broken pipe... a harbinger of the coming collapse. As other’s have pointed out something snapped that was loud enough to wake people up and come running out of the building next door with their cameras. Misaligned sliders that suddenly wouldnt close, water pipes torn open, appear to be warnings. Its easy to mask the tragedy of this event with technical speculations.
But translating at the end the lady says “awww they died... they all died my god...”
Hearing that sure cleared my eyes...
An update to the article says the video was taken 7 minutes before the collapse.