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Video tape isn’t really that durable over time. Most of the info I can find comes from digitization services, but they are fairly consistent in saying that, for tapes that are stored in “normal” conditions, you can expect 10-25% degradation in 20 years. These tapes are 40 years old. They have likely degraded significantly already and may fall apart when played.
Whether they have wifi on ship or not isn’t the issue. Sometimes, when a ship goes into an operation, they will turn off all signals except passive or directed signals so that they can’t easily be detected. Having a communications signal that isn’t under the control of the ship’s officers is a huge security risk during operations.
Someone is going to be court martialed over this.