I don't see what so special about apple. A lot of entities manage to keep secrets very well. They use a mix of paying their employees well, having a company culture around innovation, a good security system, and contract promissing to sue you to death if you rat.
Take the CNES (National Centre for Space Studies in europe): they have individual scanner gates at each entrances. You can't get in without your whole body being trapped in a tube, alone. You can move anywhere without the proper clearance, and often somebody going with you. Each room is locked out with a card system. All the corridors look the same, so an attacker would have a hard time going somewhere specifically. The IT system is seriously locked down. Yet in all rooms you'll find prototypes, scale models and pictures, so that everybody is proud to work here and feel a sense of responsibility.
Protecting industrial secrets is not an apple thing.
This comparison is laughable. Apple faces far more scrutiny than CNES.
https://arstechnica.com/gadgets/2018/09/reports-apple-airpow...