No ,does not mean this thing is over.
But, I’m betting Prigohzin’s life span is a now a little bit shorter

And now that someone was able to do something so anti-moscow, albeit as a stunt, other people may get ideas.
People such as the far rigt in Russia, or any credible opposition party, or even a section of the military.

But one thing’s for sure - Putin’s not going to be able to sleep soundly for a little while