There's basically no content in there, only speculation unless I missed something.

The "surprise" is that there are four dies in the CPU, two of which appear to be unused (I'm not sure how they reached that conclusion, I can't see the video).

It's not particularly surprising or novel though, and there can be many reasonable explanation about why they would do such a thing and the article doesn't reach a conclusion. Silicon is cheap, maybe those are non-functional dies just here for mechanical reasons.