Alright, let's wait and see.I definitely heard the “k” sound after listening to it several times via your link. Plus he was listing the 20 series using his fingers. So, I definitely do not think he repeated “Hong - 20” twice.
Just being curious, no offence or mocking intended , are you native Mandarin speaker in the area represented by Beijing(north) and Shaanxi (central and west)? Because I know that even Chinese outside these regions pronounce "h" differently. h and k in some cases depending the following vows can be difficult to distinguish by people outside these regions.
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