“ anything that can’t produce evidence of efficacy.”
This in itself is kind of a minefield. It’s very easy, for example, for pharma companies to prove that their meds can make more people feel better than random chance. It may be much harder to prove that other types of therapy, - particularly those that involve long term work - are more successful, even if they have the potential to have a much more significant impact on a persons life than just temporarily improving their mood a bit. Not disagreeing that the profession needs a purge, but unfortunately it wouldn’t be as straightforward a task to evaluate outcomes as it is in other forms of medical treatment.
Really what is needed - within the confines of capitalism - is to make therapy free and readily available so that people can find what works for them. I mean it even makes sense for capitalists to do that, in the sense that a happy worker is a good and content one. But neoliberal austerity will never allow it. To that system the working class are unthinking cattle to be herded with a club.