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
maybe they can read him the last rites.