Arcana Coelestia # 6129
6129. 'That year' means the period covered by that state. This is clear from the meaning of 'year' as a whole period from start to finish, dealt within 2906.
Isaiah 23:15
15
It will come to pass in that day that Tyre will be forgotten seventy years, according to the days of one king. After the end of seventy years it will be to Tyre like in the song of the prostitute.