I have met Sachkov and a few other execs, visited Group IB's offices in Moscow, and attended their rather good conferences in Moscow twice. (For what it's worth, I've also worked in Russia on and off since 1991 and speak Russian).
I am very surprised to hear this news. Group IB always worked closely with MVD and other Russian law enforcement agencies to target Russian organised crime groups. They understand the security landscape very well. They have never and would never cut across the Russian state's interests - although I can imagine low level corrupt officials might have been affected.
I hope this is not connected to their recent decision to co-locate in Singapore. If it is - this show of strength by the Russian state will have the perverse effect of pushing other Russian entrepreneurs and IP-heavy businesses to transfer assets and people overseas.