I'm someone who finished a PhD, here's my perspective.
You don't believe your supervisor or your research group and so you quit, great. It's great that you have the critical thinking abilities and confidence in yourself to make such a decision.
However, I think it's extremely unprofessional to write a blog post saying that your supervisor is superficial or your research group is performative art. I don't say this because I think we should just take the venerable professor's word for it, but because accusations in general, if they're vague enough, are impossible to defend against. I think if there's enough substance to make your comment specific, you should. Maybe even write a paper explaining why what they're doing is nonsense. If you're right, this would genuinely be a contribution to the field.
If you can't be specific enough to be scientific about it, just keep it to yourself.
You don't believe your supervisor or your research group and so you quit, great. It's great that you have the critical thinking abilities and confidence in yourself to make such a decision.
However, I think it's extremely unprofessional to write a blog post saying that your supervisor is superficial or your research group is performative art. I don't say this because I think we should just take the venerable professor's word for it, but because accusations in general, if they're vague enough, are impossible to defend against. I think if there's enough substance to make your comment specific, you should. Maybe even write a paper explaining why what they're doing is nonsense. If you're right, this would genuinely be a contribution to the field.
If you can't be specific enough to be scientific about it, just keep it to yourself.