I think it's absolutely crazy and irresponsible to do a press conference on a paper that you haven't even released a preprint of. I really hope that there aren't any issues with the actual publication, because if there are, they're going to cause a great amount of damage to scientific credibility, which so incredibly important right now.
Despite it opposing their previous stance on it? They're now mostly backpedalling, and discrediting the study. Or, at least, how it was presented - but can anyone blame them for that?
All statements made in the paper are marked with "vorläufig", which translates to preliminary.
Considering the gravity of the situation, I don't think it's bad to provide preliminary results, but that's probably highly debatable.