Much of the damage to the power grid can mostly be mitigated by turning off electricity, although this is a difficult thing for power companies and grid operators to do. One issue this article doesn't discuss is the risk to undersea internet cables[0]. Undersea fiberoptic cables need repeaters, these need electricity, so they have very long conductors and it's expected that sea water's conductivity could make induced currents worse. Shutting off power won't necessarily work, because induced currents could be 100x more than the equipment is rated for. Although, global connectivity is still likely to exist.
[0]https://ics.uci.edu/~sabdujyo/papers/sigcomm21-cme.pdf