Pretty awful to read, I feel very sorry for him. He's right too, that's pretty much how L/E deals with it.
When I left my wife back in 2004, I was warned by a police officer that I shot with to transfer all my firearms out of the home prior to giving her the news that I had already rented a new place to live, and was leaving her the house. Here in Canada, keeping your gun license is in your wife or cohabiting partners hands, she has to actually sign your application to "allow" you to have them, and is quite often the first thing the wife's divorce lawyer advises - go after his guns and license, just say you feel threatened and scared, and the police will come and seize them, and take him away! That's literally the word for word advice they give, and what the lawyer told my soon to be X. I told her I was going, then a couple days went by.
Luckily, when she called the government 1 800 number they have specifically for this purpose (yes, that isn't a joke), I just let her go on with them on the phone, explaining that although I'd never once been violent around her, raised a hand, my voice, anything of the sort, me having guns scared her and she felt threatened and thought I might "use" them, after being coached through it in a similar manner to what this guy went through. What a joke. When the police arrived about 15 minutes later, I handed them my friends card, who was a Sargent in another division, and said "I transferred every single weapon and every round of ammunition, and even my pocket knives to his custody 2 weeks ago". I was lucky, having prior warning, I was able to turn it around on my lying X, and it looked very bad on her, and helped in the later dealings. If I hadn't known that was how it usually went, I would have lost everything, 50$k worth of stuff, my job, which was in that business in one way shape or form, as well as all the other legal hassles.
Never having had kids, I can't imagine how awful it must be to have them used against you in a split, or go through what the guy in this article has, but I have some small idea how it feels to be betrayed and lied about by your wife, who is nice as pie one day, then turns into something quite different when life takes a turn she doesn't want or like, and lies to the authorities, especially based on legal council, and it's considered "ok" behavior by some groups to do so, so long as the end result works out in the woman's favor.