Assuming they have a solid and reasonable argument against it and not just hand-waving and throwing toys out of the pram :-) . In which case, if they do, I would love to see it.
Hmm sorry, I've never heard of TDD guaranteeing quality of a product. It _might_ mean you've delivered what's been asked of you (along with acceptance testing) but quality? Far from it. And if you're unit testing _after_ the fact, then you're just asking for trouble.
Which perhaps shows how little "folks" care about who they share their data with. Additionally I have private organisation repos that I really don't want you taking a peek at. Sorry, no dice for me unless this is tightened up.
That's usually what drives people away from TDD. A very good approach for this is described at this article by Dave Hunt: https://medium.com/@davidihunt/tdd-and-complexity-1bbd5ca51e...