[bigmealbigmeal]

I would posit that the person you're replying to is challenging the title, not the article. The title and the article are incongruent.

The article essentially suggests that considerable solitude is required to really take one's writing to a higher place. That might be the true, or it might not be true, and it depends on how we define 'good writing'. But we can agree that it's not so easy to dismiss.

On the other hand, the title plainly states: 'creativity requires solitude'. That's a clear-cut statement. And it's extremely debatable. Not to mention that Rilke never even said that.