Maybe. That's quite the overstatement by Mr-popular-writer-who-I don't-read and now I recall why.

and the next line--"likely remove your writer's voice," --not if they are a good editor

I did say in a post a couple of years ago, "I agree that one should not rigidly follow rules of grammar if it means sacrificing flow or meaning." https://medium.com/illumination/to-conform-or-not-to-conform-f7d025b4194b That only 3-minute piece covers a few topics and includes a link to an article I appreciated about grammar or not to grammar: https://medium.com/writetoedit/does-grammar-even-matter-anymore-1a6f88bb5cd5