I did read the second paragraph:

> Now before you mention NIH syndrome, yes, we looked at the existing Go implementation, go-webdav. This library was lacking some key features we needed, like server-side collection synchronization, and the interfaces didn’t really align with our data model. This is also going to be a key feature of our product, so we should have some level of ownership for what gets implemented.

This is a different, non x/net library.