Some may not have a garden at all.

That fact is not at odds with how I read the author.

And although I am sure there are artists with practical vegetable gardens, artists who neglect their withering house plants, and souther artists whose gardens are overrun by kudzu, that doesn’t bother me in the context of the article.

When I read the article I am thinking about gardens like Monet’s and not everything that might be a garden and owned by someone who might be called an artist. I just don’t think that’s what the author meant.

It’s hyperbole not bullshit.