Did you look at the photos of the hook, it should be visible to a proper inspection. That marketing video of inspections is either picked for nice panning shots, or is simply inadequate operation to make it look like they can inspect faster than they should to be effective.

Where a park can't be verified, its replaced regularly.

Replacing them every 30 years won't bancrupt anyone.

Can't you just infer it by how much of the original eye is unoccupied?