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You know more about this than me, but I think it's more like a buffer with an extra long DHW coil running through it. Although I see why they're not calling it that.
It's not that innovative and for me that's what's good about it, it's a simple effective solution to a problem.
When you say pre-existing tech is anyone making anything the same already? They've got Newark lined up to make it and the main attraction for me is it hopefully being available soon (the only place we can really put a cylinder will eat into our downstairs loo with a full sized cylinder) so if you know how to do this now I'd be very interested!
Is it not just a small thermal store with a DHW coil running through it? Where's the innovation?
It's great if this enables more ASHP installs, but unless I'm missing something it seems like a load of hype over pre-existing tech packaged up nicely tbh...