That sounds about right, but you know, the caveat there is that the phrase "right now" should be in the agent's explanation:
"the hierarchy of people they're concerned about right now, the guy with grandpa's eighty or hundred year old pistol rates slightly below "who's gonna take the trash out this afternoon"
The agent you talked to is a good common-sense guy, it seems. But his verbal isn't ATF policy or the law, after all.
When I was fooling with muscle cars, after a big show one day, a home town cop ordered me to do a burnout. If his boss saw me doing that, no amount of "but that officer said" would have been good enough.
(Yes, I did as ordered)