I watched a youtube video on this recently, and I believe that they never mentioned battery lifetime in it. This article said that one of the chemistries only lasts a few hundred cycles, but, because of the use pattern of the dual chemistry is "expected to last the lifetime of the vehicle".

I really hope this turns out well, but given the current lack of specificity, I'm going to guess that overall pack longevity is going to be the Achilles heel of this battery.

Always happy to see people trying innovative new ideas though. Most of them won't work, but we can only find the ones that do if someone tries it. Hope this one turns out better than I fear.