Not really “singled” out, from this article

He also clarified in a public letter to Cohen that the pledge requires “all guests whom our guesthouse identifies as potentially having been involved in war crimes to sign the form,” including those from Burundi, the Central African Republic, Ethiopia, Mali, Myanmar, Palestine, Russia, Syria, and Sudan.

Also, the officials aren’t huge fans apparently

The Japan Times quoted a city official as saying WIND VILLA had not violated Japanese law, but the pledge was “inappropriate”.

So it seems the hotel owner is worried and doing a manual check. There’s probably a better way to vet people but considering where he is idk if it’s as simple or legal