Let us suppose for a moment that Gugino was using police tracking software on his phone. I've no idea how this works, but the story suggests that you point the phone at a radio source and learn the frequency it's using so that your allies can block that frequency. I have no idea if this is feasible or not, but suppose it is and suppose that this is what Gugino was doing when he was pushed.
How does that affect anything? For his activity to matter, the cops would have to know this is what he was doing. Furthermore, pushing him to the sidewalk would have to be an appropriate response. The cops saw a man holding a cellphone. It would take a remarkable attention to detail in a chaotic situation to correctly apprehend that he was working in cahoots with someone with a blocker. Pushing him down wouldn't be effective unless you knew that doing so would take him out of commission (as it did in fact). Barring an injury, you'd have to confiscate the phone or otherwise prevent him from using it.
It is a nonsense theory that justifies nothing that happened to the man, far as I can tell.