I think as an opinion piece it's interesting and plausible, I especially liked the but about trans people coopting the language of abuse to describe not being given everything they want, instantly and unchallenged. This is something we've seen several times in every age group. But there's no new research referred to here, just suppositions based on the Littman papers.
It also talks about the "LGBTQIA community" but then exclusively discusses "trans declared kids" (which is a great phrase). So it seems a bit muddled from that perspective, not least because the "I" is a medical classification not an identity.
It would be very interesting to see this article expanded on in a way that seperates out the LBG from the T and defined it's terms a bit better. Yes, a cult like parental alienation is absolutely happening to children who say they're trans, lead mostly by older males online. They may well be storming out when they're mum doesn't instantly agree to hormones and calling that homelessness. I even saw an article once by a young transperson who said that they considered themselves homeless despite actually still living at home because their mum wasn't being supportive enough. She was still doing all their laundry and cooking as far as I could tell, but because she wasn't 100% supportive the author had decided that they "identified as homeless" or some equally stupid crap. However I also have a bi friend who's mum remarried and then converted to her step dad's religion (JW) and the two of them subsequently gave her so much shit for her sexuality that she chose to move out and live with friends until she could rent. She wasn't ever asked or told to leave, but they also didn't leave her much choice. And then there are people who really get kicked out by homophobic parents and end up on the street or in shelters. And I just don't see how any of these situations can fit meaningfully into the same catagory.
So it's an interesting article insomuch as it raises some interesting questions, but I don't think it offers much in terms of answers and any research into this area needs to be a lot more nuanced in terms of how it looks at different groups, parental relationships, methods of becoming homeless, definitions of homelessness etc.