Badly written (lacks basic proofreading!) and has elements of utter bullshit, like this:

"A Ruger revolver was said to have been recovered at the site an hour or so later... The Ruger had an empty magazine and it was not in the lockback position, indicating it had not been recently fired."

Whether or not the slide is back says nothing about how recently a gun was fired.

But the more basic problem with this account is that revolvers don't have magazines. Or slides. And they don't eject shell casings automatically.

The ShotSpotter bullshit doesn't surprise me at all. They make their money on politics, not science. I don't know of a single case where ShotSpotter data made the case for a conviction anywhere.