They're definitely implying a bit of a false story with the information presented, but I also don't think the truth is going to be much better. If the police in DC were following a tip from the police in Texas, this guy almost certainly had stated plans justifying detainment that led them to the Naval Observatory, and breaking firearms laws was just a more concrete reason to keep him arrested.So there are some interesting omissions in the OP article. While the guy himself was arrested outside the observatory, according to this the gun, ammo, and mag(s) were indeed inside his car. That he was not in. Because it was several miles away in a parking garage. That he had to lead them to.
I'm thinking that some people might be enhancing the truth by omission here.