The only case in which you might get the source code as a result is if you paid for the source code. Which is the complete opposite claim of what is being made on this page.
[0] https://www.zendesk.com/company/agreements-and-terms/master-...
I don't think that's true - common law would consider the contract void when broken or not properly met, and award damages, not enforce it.
If a builder doesn't finish building a wall they award damages - they don't march them back to your house and make them finish building. That's a pretty fundamental part of common law.
It doesn't logically make sense to concurrently argue that you were misled that the software is FOSS and believe that you exchanged money for source code.