Counter in the header

Hi,

I found this article, https://support.yithemes.com/hc/en-us/articles/115001372967-Wishlist-How-to-count-number-of-products-wishlist-in-ajax, to add a counter through a shortcode but it is not working anymore. It just shows me the shortcode when I add this.

Does this code needs to be updated to work with the latest version of the plugin?