HyperMac literally bought Apple adapters and chopped off the cable. I'm not sure how much more Apple-proof you can get than that. What you need to be is "lawyers on retainers who can keep draining your law funds"-proof.

edit: another comment suggest a MagSafe-MagSafe2 adapter is used. That's an interesting solution that may very well work if they require the customer to buy it themselves, as I believe the Apple patent hinges on using a magnet. Of course, they may want to argue that in court. For years and years.

Apple under Jobs might be different to Apple under Cook. Potentially they have Apple's blessing. Suppose a promising YC company was just going to make it for the newest Samsung laptop otherwise. What would you do if you were Apple? Just speculation, but that's how I imagine "Apple-proof" meaning, especially if there's some agreement that they can't announce yet.

The claimed performance would provide a huge competitive advantage. If it worked as advertised and Apple had control over it, they'd integrate the software into their products and this box would never see the light of day as a third party product.