Neither of these are exactly "soft" power, I think you're misinterpreting the term somewhat.
Soft power isn't so much to do with "diplomatic" power, but mainly the ability to more subtly influence others through positive attraction, such as through culture, religion, arts, film, music, fashion etc (such as Hollywood films acting as propaganda for US capitalist ideas, even when not made to explicitly do so). And in all honesty this is arguably one of China's weakest ways of projecting itself overseas, compared to the west. I'm just struggling to see how that really ties into the discussion here.
Probably just because of the nice conference halls, must be a hell of a business now after decades of doing it. Bet they've got some of the longest tables in the hosting industry these days.