Merchants in Austria and Germany will no longer need to provide an impressum URL for local inventory ads and free local listings. An impressum is now only mandatory for in-store product and price availability hosted on Google. Switzerland still requires it for all local ads.
This change was detected on Google’s help page, reflecting an update that simplifies the process for merchants in these two countries. Previously, an impressum was required for Austrian, German, and Swiss merchants (DACH region) to use local listings and inventory ads.

Read the official help page here: Add your impressum (Austria, Germany, and Switzerland only).
This update was spotted by Hana Kobzová.