Yes, that much is true, the whole “Fancy Bear” angle is pretty much baloney invented by Crowdstrike and swallowed uncritically by the government.
In fact, there was an old investigation done on reddit that pretty much conclusively showed that the whole “Guccifer 2.0” thing was an invention of the DNC or someone working on their behalf to set up the “Russian hacker” narrative. I think those threads have disappeared down the memory hole now.
I'm going to go out on a limb here and guess that you did not read the Mueller team's indictment of 12 Russian GRU agents for the hacking of the DNC. There is a lot of information in there, and Crowdstrike's suppositions are not the only evidence.
I suggest, if you are interested in "who hacked the DNC" you need to read the Mueller indictment.
Here it is: