The issue you're referring to has nothing to do with Stylus. Suggested styles are hosted by userstyles.org, which is a third-party website we have no control over. We can only use the API which they provide, nothing more, nothing less.
They have chosen to reject connections they deem suspicious, presumably, VPNs using shared IPs. Users report similar issues, even just attempting to browse the site itself: https://forum.userstyles.org/discussion/comment/125165