I run a product similar to Mintlify.
We've made different product decisions than them. We don't support this, nor do we request access to codebases for Git sync. Both are security issues waiting to happen, no matter how much customers want them.
The reason people want it, though, is for SEO: whether it's true or outdated voodoo, almost everyone believes having their documentation on a subdomain hurts the parent domain. Google says it's not true, SEO experts say it is.
I wish Mintlify the best here – it's stressful to let customers down like this.