You would need to re-connect the disabled archive to the primary and move it that way.
https://jeffbrown.tech/connect-an-archive-mailbox-in-exchange-2013/
then new-moverequest with the -ArchiveOnly switch to move them if the primary is already moved to the new database. Then you can disable the archives again if you want.
Otherwise, don't do anything and leave that old database intact until the deleted mailbox time is met and those disabled archive mailboxes are purged.