Of more interest to me is how did the damage get fixed? From the article, it is possible to repair some aspets of transformer damage. It is my understanding that USA does not, cannot manufacture transformers.
Possible union problems, provide cover for either: economic enemies (China) or Pieceful religions. A badly powered down Silicon Valley would cost a lot of economic damage, depending on how long it was impacted.
The transformers that were damaged were not the much larger transformers that are outside the turbine building at a power plant to connect the generator to the switchyard. Utilities have spares for smaller substation transformers. They’re still manufactured in this country.