Here is some more information for you to look at, I know you do lots of research.
https://www.zerohedge.com/markets/engineer-firm-warned-major-structural-damage-miami-condo-tower-collapsed
But that would mean surrounding buildings are probably sinking at the same rate and the amount of spalling could be near what the Champlain towers is sinking. Their const. could be worse but you gotta wonder how much worse. I'm familiar with spalling. I had it in my last house. It's real common,you grind the concrete down to the steel, paint it with two part epoxy and wait until more concrete starts slowly dropping and repeat the action.
Unless they are the very first to implode it still seems spooky that there were light flashes all over. I doubt gas would show up like that in more than one location as the tv station camera showed but who really knows.