Yeah, this seems to make no sense from the outside and the data I've seen, which all puts this in fairly normal ranges. And not enough transparency into the why then IMHO. But well, transparency into why this is supposed to make sense is something sorely missing from German covid policies for a long time now...

EDIT: as pointed out elsewhere, the official press release gives us that there has been new data in the past few days with a specific concern, that's at least some info.