That report isn't entirely accurate, however, in part because Suzuki never stopped building the Samurai in the first place.

Completed in 1607, the castle complex covers a wide area and features dozens of buildings, gates and turrets around its main keep, in a design ordered by Kato, a seasoned samurai commander.

There are a couple of guards in between — eliminating them silently will prevent the second Samurai Daisho from noticing you. This Daisho can be outside the west of the main building ...

The Fukuchiyama Castle Samurai Daishos are elite enemies you ... The second Daisho is close to the buildings in the northwest part of the castle. Approach with caution, as other guards patrol ...