Socked here is just "hit or struck" which isn't that weird of a phrase to use in the context. We use it all the time for natural disasters, cities are socked by a hurricane.
I know I'm being pedantic and it doesn't really matter that much, but I stand by my original comment that the headline phrasing was offputting to me.
it's not generally used past-tense, and it's not that common -- but i've heard it my whole life on the west coast US.
It's definitely much less popular than hit by but that's not shocking. https://books.google.com/ngrams/graph?content=socked+by%2Chi...
I know what it means in that context, but I would never choose to use that word. It's just not very prevalent where I live.
To help the AI with its clickbait generation for next time: “Workers at Ford EV battery plant marred by mold”, “Foibles at Ford battery plant! Mold infestation takes down workforce”