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Eyes in the Sky: A Comprehensive Survey of Ukrainian Unmanned Aerial Vehicles (UAVs)
(www.lvivherald.com)
This is a most excellent place for technology news and articles.
From what I read they actually work with 3rd party analog receivers from the drone itself.
Ex: https://www.reddit.com/r/fpv/comments/16n8ztu/hi_dji_goggles_for_analog/
That was a feature where you could attach an analog receiver to their Goggles v2. They have since removed it in newer Goggle versions. Their system is basically a walled garden now.