Iridium was able to be resurrected only because the Falcon 9 slashed the cost to replace their satellites, it was a shell of a bankrupt company for nearly two decades.
Iridium was "resurrected" from their bankruptcy over 17 years ago, in 2001. Their resurrection has nothing to do with the Falcon 9, and they were planning on launching The NEXT constellation before Falcon 9 was even on the scene. If not F9, they had plans to use the Ukrainian Dnepr. The Falcon 9 ended up letting them do it for cheaper, but that still doesn't mean Musk or SpaceX were necessary (or worthy of thanks) for it to happen.
They went 15 years post-bankruptcy floundering around post bankruptcy without being able to replace a single one of their rapidly decaying satellites. They made numerous plans over those 17 years and none could get funded because they never made financial sense.
They could never get funding to use Ukrainian Dnepr rockets even if they were cheaper than SpaceX. The Ukrainians rockets payload capacity is far smaller than a Falcon 9, quality is questionable, and clearly would never have been able to hit the cadence Iridium needed (only 9 launches this decade, barely more than one per year).
Then SpaceX came along. No-one thought the Falcon 9 would be a success, because it was so ambitious compared to the Falcon 1. Then no-one thought SpaceX could be competitive on pricing, and SpaceX blew everyone away on pricing way before they even started re-using their rockets (because Musk and his team were smart enough to design the Falcon 9 to be the first rocket that could be mass assembled. He's not Tesla or Edison, in reality he's Henry Ford). SpaceX's success proving the Falcon 9 was a big reason iridium got the massive funding they needed for the new satellites.
