The above talks about sulfur being released from planetary strikes. Both in the form of sulfur from the object, and the object hitting rocks that have sulfur.
I'd be interested in seeing some of the photos you mentioned from the air. I did a quick search and didn't see anything. The movie you linked to previously, the structures might look like buildings, but pretty sure they are just natural rock formations.
And while God can use any mechanism He wishes for a miracle to happen - I think He often uses “natural” phenomena which He can control if He so desires.
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Learn some basic Physics and chemistry.
There is no way sulfur could reach the surface of the Earth from above. It would be heated well above the ignition temperature far above the breathable atmosphere. All that would remain is hot sulfur dioxide (a gas).
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There is no rock in the ruins it is all ash.