When articles which focus on vulnerable minority groups, which many people don't have much direct prolonged contact with, pair up that social group with a particular association, that more readily becomes a focal point and a stereotype for that particular group, due to the larger lack of public knowledge about them.
Right, but the article is reporting the current state of affairs. It's not saying transwomen are bad, it's saying this is happening in society, And the worst part of the article for transwomen is Stonewall's homophobic statement.
If stonewall and others hadn't been telling lesbians they're transphobic if they don't change their sexual orientation and if they hadn't been telling transwomen that lesbians are the problem, then we wouldn't be in this mess and transwomen wouldn't be going on tinder dates with lesbians without mentioning the fact they're trans beforehand, as if there's no way in the world it might be relevant to a lesbian.