Visio and GANTT visualization certified or not?

Hi, are the following custom visuals certified or not?

Visio add-in:
https://appsource.microsoft.com/en-us/product/power-bi-visuals/WA104381132?tab=Overview
GANTT add-in:
https://appsource.microsoft.com/en-us/product/power-bi-visuals/WA104380765?tab=Overview

They are not on this page::

https://docs.microsoft.com/en-us/power-bi/power-bi-custom-visuals-certified

However I think they were listed as certified on a similar page that was published on Azure(seems to be down now though).

I really want to be able to use them but we cannot have any information sent to a 3d party. (using on-premises server) 

Just a thought, could I verify the code myself?

Thanks