As someone once said, 'if you can't blind them with brilliance - baffle them with bullshit'.....
Translation: Our supposed chip is 3d (stacked dies) and for whatever reason we decided to waste precious die space by encrypting the normally un-encrypted data IO between the chip and the controller. The chips is an ASIC - look it up in Wikipedia.
Actually this part just looks like a very bad, non-technical translation of a sensible technology. When routing signal between the chips it is worthwhile to replace wide parallel buses with narrow serial ones. The circuit is called
https://en.wikipedia.org/wiki/SerDes .
Now when you have multiple serdes-es working in the same equipment it is further worthwhile to shape the electrical noise with a
https://en.wikipedia.org/wiki/Scrambler . The modern scramblers/descramblers are usually trivial encryption/decryption circuits designed to provide
https://en.wikipedia.org/wiki/Decorrelation to minimize mutual interference.
Much better translation would use alternative names for the same things:
https://en.wikipedia.org/wiki/Signal-whitening and
https://en.wikipedia.org/wiki/Whitening_sequences .
Notwithstanding the above I agree with the general trust of your post regarding 'baffling with bullshit'. But this particular piece of bullshit looks more like a standard marketing baloney very badly translated from Russian to English. Or maybe it even wasn't direct translation but a multi-step one with German somewhere in the middle.
Edit: I particularly agree with this statement:
But perhaps their target is not the end users but some naive venture capitalists.
