济州航空香港飞韩国航班是不是必须有韩签才能登机？

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今天打算上IATA数据库打印持有日签过境韩国免签条款。结果发现没有了日本签证这一项...（上个月查询时明明 还有日本在上面的...)
Visa Exemptions
Nationals of China (People's Rep.) with a visa issued by Australia, Canada, New Zealand, Switzerland, USA or an EEA Member State if in transit through Korea (Rep.):
- holding confirmed onward tickets on flights departing within 30 days; when
- arriving from a third country, departing to the country that issued the visa (e.g. PVG-ICN-SFO); or
- arriving on a direct flight from the country that issued the visa (a visa that expired on departure from that country is accepted), departing to a third country (e.g. SFO-ICN-PVG).
Not applicable if traveling in a group.
Not applicable if traveling from/to Northern Mariana Isl.
Not applicable to holders of an e-visa.
不清楚是韩国过境免签政策调整了，还是IATA单方面调整了规定。

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刚致电韩国驻广州领事馆，对方回复日本还是在过境免签第三国里，过境免签政策没有调整。
为什么IATA数据库会调整了相关规定呢？
航空公司会不会遵照IATA规定而不按照韩国出入境政策？