I will be very interested to see the follow up on the suppressor, or even if it is one (other than homemade field expedient). They said a bunch of firearms purchases recently, but though I haven't gone through the process yet, a suppressor takes time.
Limited information makes it sound like he only recently acquired firearms, so some possibilities:
He had firearms beforehand and went through the whole suppressor acquisition process sometime in the past.
Homemade suppressor.
No suppressor and/or the media doesn't know what it's talking about.
Either way, yeah, suppressors will be in the crosshairs with the anti's PR being that they are whisper quiet and you can buy them at the grocery store, and then of course ARs, even though they had nothing to do with it.