What a waste of public money. It tells a lot that they dont try just creating a mastodon instance but that would too cheap. Public media in Germany also has a very strong left bias. (see https://www.medienpolitik.net/2021/02/das-herz-des-journalis... ) (für die Deutschen auf HN: Hier ein Podcast https://www.welt.de/kultur/medien/article228196819/Podcast-W... wo der Autor seine Thesen noch einmal genauer erläutert. )
Nothing there states it will NOT be a Mastodon or rather Fediverse/ActivityPub server. A likely outcome of this is, that their online video platforms will get ActivityPub support as explained here by Leonhard Dobusch, a member of the ZDF Board of Directors that approved this: https://chaos.social/@leonido/109829771565248856 (german)
But you cant start a project to explore Open Protocol options and pre-empt the outcome. The working group on this will figure out the best plan and it will likely be ActivityPub, because what else is there ?
> What a waste of public money.
You have very strong feelings about something you don't seem to know much about.
> Public media in Germany also has a very strong left bias.
*Educated people have a strong left bias.
Also your first link bases this on a poll of "Volontariat" journalist, meaning journalists in the beginning of their career, meaning young people. Congratulations for proving: Young people tend to be leftists. Applause for this groundbreaking discovery.