We checked on our end and the external links test is working fine with the Avada builder. Can you please confirm if you are adding the links directly to the content using the text block or using some other widget or a template? Please also share the URL of the affected post.
We just had a look at the page you shared, and it seems that the only external URLs present in the post content are from Instagram and are inside a button.
Just to test if the buttons are included into the Content Analysis API implementation of Avada, could you please add a link into a piece of text on the page and link to an external resource, even if just temporarily, and check if that triggers the test?