The date given is incorrect, below is the correct information from the DeLonghi site:
(limited time promotion: buy promotional model in the period 15.09.2020 - 15.01.2021 and register within 3 months).

If you buy a DeLonghi Premium coffee machine between 15.10.2020 and 31.01.2021, you will even get a free 5-year warranty!
Condition: You register your new machine at https://www.delonghi.com/de-ch....
Afterwards you will receive a certificate for the 5 year warranty by mail.