For context, the other two Western games that received 40/40 scores were Skyrim and GTAV. Famitsu has been in print since 1986, and only 22 games in total have ever gotten 40/40s. In general, Japanese publications are not as generous with perfect scores like Western ones.
It should be said that Japanese and Western audiences have different tastes, such as Dragon Quest IX and 428: Shibuya Scramble receiving perfect Famitsu scores. So for Ghost of Tsushima, a Western game set in ancient Japan, to achieve this is truly a remarkable accomplishment.
The linked thread on the positive Japanese reception to The Last Samurai (mocked by Western reviewers as cultural appropriation and White Man Savior BS) is also worth a read.
For those wanting proof, here's the Famitsu review(s) being referenced.
As Oliver continued:
The linked thread on the positive Japanese reception to The Last Samurai (mocked by Western reviewers as cultural appropriation and White Man Savior BS) is also worth a read.