ReviewX doesn’t currently ship a dedicated LifterLMS integration. If your courses are set up as a custom post type, you may be able to collect reviews on them using ReviewX’s generic Custom Post Type support — worth testing on a staging site first, since LifterLMS’s course structure may not map cleanly onto a simple CPT review flow.
For a dedicated integration, keep an eye on our changelog or reach out to our support team to register interest — feature priority is shaped partly by how many stores ask for it.