SSD used for tablespace died. How can I recover data?
In my hands, just creating an empty tablespace directory allows recovery to proceed and the database to open.  Either change your mounts so that the existing path of the tablespace now maps to a valid directory again, or delete and re-create the symlink  "PGDATA/pg_tblspc/16394" so that it points to a valid empty directory on some other mountpoint.

I think that this should much safer than monkeying around with pg_resetwal.