Ah yes, just be independently wealthy.

Many working novelists have described being pressured by their publishers to write whatever the publisher believes will sell, and many have given in to the pressure because ultimately they need to eat. Arthur Conan Doyle famously kept writing Sherlock Holmes stories despite hating it, because the public and his publishers demanded it. The foreword to Ursula K. Le Guin's A Wizard Of Earthsea talks about how she was convinced to write a children's/YA book despite not really wanting to.

The post you're replying to maybe overstated things, but was much closer to reality than your post.