Depends on how you frame it, the employee still owns the work in the sense that they are the copyright holder. But the employer is granted exclusive usage rights to the work, so you wouldn't have the rights to license it to someone else as is encouraged in the article.

That would be relevant, for example, when the company goes defunct, and no one else holds any usage rights for the work. Then you'd regain those usage rights.

That of course is iffy to make use of because you'd need to be sure that you are considered the exclusive author, and that no one else acquired these exclusive usage rights.