This is good advice if we ignore the headline completely.
If you want to see what I mean, record yourself talking sometime, a few minutes is fine. Make a transcript, and read that. Ideally, if there's someone around who can do the favor, have that someone edit the errors in transcription and punctuation first, so that part isn't conflated.
It's not going to look anything like good conversational writing.
The flip side is that someone setting out to "write like they speak" will instead succeed in writing in a conversational style, if anything. When that's good is another question.
If you want to see what I mean, record yourself talking sometime, a few minutes is fine. Make a transcript, and read that. Ideally, if there's someone around who can do the favor, have that someone edit the errors in transcription and punctuation first, so that part isn't conflated.
It's not going to look anything like good conversational writing.
The flip side is that someone setting out to "write like they speak" will instead succeed in writing in a conversational style, if anything. When that's good is another question.