Not a good look for Russia and their military.
I think you correctly identified the takeaway, or at least the new information presented here. The nuke threats aren’t new, but this would indicate an increased probability they could be used at some point.
Most people don’t realize it, but Medvedev did serve as Russian President for several years in place of Putin, so he likely has a huge group of supporters in Russia who still wish he was President, instead of Putin. And from our perspective, based on his constant references to Armageddon, he may be even worse than Putin if he becomes President somehow again.
It’s still too early to know how this will play out, but this is simply further proof it’s being ratcheted up further every day.