While there's nothing stopping this technique from being accessible in principle, the example given in the article is a really bad one.

The article uses "Email us!" as the label on the svg and a elements, which effectively hides the actual email address from screen readers. Using aria labels in this way is a really bad practice, a screen reader user should have the same experience as anybody else unless there's a very good reason to do otherwise, and if you think your reason is a good reason, you're probably wrong.

The proper way to do this would be to put the actual email address in the labels,.