This root CA was the root used for all non-EV GeoTrust SSL Certificates up until July 22, 2010. Tableau will upgrade the certificate on its site, but it shouldn't have to, as Geotrust warned vendors that the certificate was still in use (italics mine): The software developers at Tableau tracked the problem down to Apple, which had unilaterally dropped the Geotrust/Equifax root certificate from its root store.

I personally tripped over such a bug in Tableau Desktop: The application's Discover pane suddenly stopped working. But that's not the case with Yosemite 10.10.3, which broke a number of HTTPS websites, Web services, and applications that download content from those sites and services. On the other hand, users and software developers alike expect minor version upgrades to fix bugs and introduce only new features that don't break stuff. Vendors of specialized applications often take longer, as InfoWorld's Paul Venezia discovered. Software developers had been working with Yosemite betas for months, so most had compatible versions of their applications ready for download within a day or two of Yosemite's release. No one who has any experience with Apple was surprised when Mac OS X Yosemite 10.10 broke dozens of applications.

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