Don’t want to belittle the achievement but they launched it as in „had it launched by the commercial launch provider SpaceX“, not on a self-developed rocket as it sounds like on the first read.
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(Fun fact: not only does SpaceX not care about not getting credit for rideshares, they actively request you don't mention them in advance publicity)
Because spacex also makes satellites, they don’t want confusion about which satellites are theirs. “MyCompany Partners with SpaceX to launch new communications satellite” is not something their PR team wants to deal with disambiguating.