So they're censoring it after it comes off the satellite but before it's sent out to the public on cable or other distribution system.
Secondly you can't jam a satellite signal on the downlink, you can only jam the uplink by squirting a signal at the satellite from the ground (As happens)
And of course you can't just jam one service, it's the whole transponder or nothing.
I don't know what satellite they use for World News in China but if they were jamming the satellite the other broadcasters on their transponder wouldn't be very keen
World News Asia Pacific is on these satellites:
Notice that on Intelsat 19 it appears 3 times, albeit all encrypted
Look to me like they receive BBC World News, decode it, delay it a little bit to give them warning of something they need to blank, they then cut to black when that happens, and then cut back when the report they want to censor is over. The resulting censored feed is then rebroadcast to Chinese viewers?
Satellite is probably used by the state run CCTV etc to reach rural areas, so such a rule might be difficult to enforce there. Urban areas, probably easier to enforce.
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Urban areas have very high cable penetration. Foreign channels such as CNN and those from Hong Kong and Macau are generally only available in hotels, not to residential subscribers.
The headline sequence is usually a good clue to the programme's running order
(But yes, a delay seems likely if they're going to all that effort)
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