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Company closure is a planned event with a timeline (it's literally part of business) and there's nothing abnormal about this. Contracts run their course and key people remain on payroll for some time. Is something else afoot? Maybe, but this looks pretty standard.
There are a lot of examples to choose from if you want to read about it. Blockbuster, Sears, dozens of tech companies... it isn't like flipping of a light. It takes time and often production isn't stopped until the very end, with those end dates usually determined by contracts.