Can't be sure with Google translate but it seems like this tweet is saying the listed ship girls are going to be downgraded from rare to normal.

Monki said:

Can't be sure with Google translate but it seems like this tweet is saying the listed ship girls are going to be downgraded from rare to normal.

I think the event "Ink-stained Steel Sakura" is being put into the war-archives, so the event-exclusive units will be put in the "normal" construction pool and core shop.

Sigfried666 said:

I think the event "Ink-stained Steel Sakura" is being put into the war-archives, so the event-exclusive units will be put in the "normal" construction pool and core shop.

Yeah, that's exactly what the tweet is saying.