I am not some brainiac genius by any sense of the imagination. However, the issue of EMP and CME are topics I was writing about back five years ago in 2015, see The Difference Between an EMP and a CME.
In my opinion, based on the linked article that was shared by Claire Rubin, there is too much of an emphasis on EMP, which is the human caused side of the equation. It is much more likely in my opinion that we'll have a CME event, since it is inevitable to have it happen in the future.
See this Center For Regional Disaster Resilience (CRDR) workshop that I was part of and helped orchestrate in my "day job" as Director for the CRDR, Interdependencies Workshop: Long-term Power Outage.
There are other associated references there that you might find helpful on the topic of CME and EMP.