Here is the full message regarding delay, via the game’s official website:
We would like to thank everyone who has a continued interest in Seven Knights: Time Wanderer.
On March 26th via Nintendo Direct in Japan, we announced the game release date would be this June but sadly, due to COVID-19, the release date has been postponed and has yet to be determined.
We would like to sincerely apologize for this situation and let you know we will do our best to meet customers’ expectations during the delay and through the launch of the new release date.
We appreciate your understanding while we wait for information specific to COIVD-19 that will determine the new release date. Again, we sincerely apologize for any inconvenience this may have caused.