Agree that the appropriation of gay rights is misplaced.
T involves a different set of political arguments as LGB, though there may be some common features of the experience like being gender non-conforming.
But as these threads bear out from the experiences of many of us, being gender non conforming doesn’t necessarily mean anything to do with sexual orientation and is not a predictor of sexual orientation.
I’m not keen on the party line in Spiked most of the time but the article you linked to does make fair points.
However, this article by the same author patronises gender critical women, and I don’t think gives any great analysis of the issues:
www.spiked-online.com/newsite/article/trans-vs-terfs-scrabbling-for-the-victim-highground/21115#.WuQf_RbTWEc