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That too. As far as I can tell, this thing has all the control and glide capabilities of a brick. At least the brick has the inherent safety feature of not being mistaken for a passenger aircraft.

I mean will a 7-seater helicopter autorotate sufficient to provide control in a power-loss situation?

Yes of course, why wouldn't it?

Here is a video of a Mi-26T performing an autorotation: https://www.youtube.com/watch?v=O27T07bIQB8

That beast can fit 90 troops or 20t cargo. Autorotation can scale to large helicopters.

ballistic parachute?

Maybe. Not sure I've seen one that will work on a 7 seater, especially with the extra mass of batteries.

Design for hot-swap batteries, and eject the batteries (with their own smaller chute or chutes)?

Forgive me if I don't consider dropping lithium batteries from several hundred meters up a safety feature.

A parachute on this system is a lot of extra mass to compensate for a problem solved when the Wright brothers were around.

There is a ballistic chute on the cirrus SF50 (their single-engine jet). It's a 7 seater IIRC (6 minimum), and roughly the same weight (2.7T for the cirrus, 3.1 for the lilium).