OSHA only has jurisdiction over the workplace. They cite the workplace for operating unsafe equipment. The workplace owner/operator might, in turn, seek relief from the machine builder.
The machine builder has OSHA looking over his shoulder too, but in HIS workplace, not the workplaces where his machines are used in production.
You may know that and I may know that but the fact remains that the story is written sloppily - and since when does a 'food plant' (as it was called earlier in the same story) become a 'manufacturer'?
While I'm griping, this simply doesn't cut it in my book either: "a frozen food manufacturer ". Call them a producer, a processor of frozen foods, sure, but a 'manufacturer' - no, sorry ...