The whole idea behind a hybrid is that it has an ICE as well as electric power. The electric adds torque and reclaims energy on braking, and the batteries are also charged while running on ICE power. And on a side note, it can also add absurdly quiet operation when electric only.
My daughter has a Chrysler Pacifica “plug-in” hybrid mini-van. It has the normal V6 engine as well as electric power. It will go 35 miles on electric only, and will do just fine if you never plug it in, just like a Prius.
So, as long as this thing is reliable, this is a serious improvement from pure ICE power, IMO.
Hybrid diesel-electrics have been the obvious solution for a lot of applications for quite a while. Trains have done it for decades.A well-built diesel is going to be efficient as all get out. The only problem is, that the environuts hate diesel engines, so it's a non-starter.