Chinese rules in leela (go program)

hey there!

could someone explain me pls why the bot counted the white stones in the left as dead?
wouldnt dat be a seki?
the ruleset is chinese.

Anmerkung 2020-08-26 001521|690x388

It is a bent four in the corner:

Black can make a ko by playing the following sequence: A8 C8 B9 A9 A8.

Because this ko can be started at any time by black, black takes first, and white cannot remove it, it is considered dead.