There it is finally:
https://www.inderes.fi/fi/tiedotteet/nixu-oyj-dnv-saanut-kaikki-asianmukaiset-viranomaishyvaksynnat-kaikista-nixun-osakkeista
Edit 1: The offer period for the tender offer commenced on 28 February 2023 at 9:30 a.m. (Finnish time) and expires on 5 June 2023 at 4:00 p.m. (Finnish time), unless the offer period is further extended or the extended offer period is discontinued in accordance with the terms and conditions of the Tender Offer and applicable laws and regulations.
These are probably the most important points.