Yes and no. This will work only if you don't create software used internationally.
If you only work in English, you will test in English and avoid uses cases like the one described in the article.
Did you know that many town and streets in Canada have a ' in their name? And that many websites reject any ' in their text fields because they think its Sql injection?
Ms O’Reilly would like a word about surname fields.
My EU country does the same. Of course software should work for the locales you're targeting but that is different from the language used by developer tooling. The GP is talking about changing the locale of their development machine so I assume that's what they're referring to.