I don't agree with that. I can't get paid if I don't use my real name and real identity online. I don't make enough money, but the money I do make helps me survive.
Women and other marginalized people are routinely told things like "On the internet, no one knows you are a dog if you don't tell them" as a way of saying "If it is a problem to admit you are a woman, don't admit it" and they fail to see how huge a problem that is.
For many marginalized people, the internet is a godsend. People who are LGBTQ are often vocal in certain online spaces precisely because they can't be so vocal in person.
But we do need to make clear that what works online if you aren't one of the privileged few may be very different from what works online if you are one of the privileged few and it's a bit frustrating that this post -- written by someone who is gay -- does such a poor job of highlighting that fact.