This is "special offer" for home usage (in Europe for 249€ excluding VAT). Also "Comes with a FREE 30-day Joan Home plan trial" that I can't find anywhere on they page how much it cost or what is providing. Does it even work without this plan?

Jean-6 that's the same device plus front light cost 549€ (without VAT) and monthly premium plans.

https://getjoan.com/shop/joan-6-1/

https://getjoan.com/pricing-plans/