Is this a uniquely USB3.0 problem? I've been in the consumer electronics spaces for 10 years & from the very beginning I would hear reports about problems for 2.4Ghz WiFi any time you were transferring data on USB (& usually EEs try to tackle this with shielding if USB + WiFi coex is important). I have not heard of this as uniquely new to USB3.

I have never heard of interference with Iridium & GPS for USB2/3 and I worked on a team that was responsible for GPS at Apple, but it's entirely possible there's shielding needing to account for this & I just wasn't closely involved in it. If this were actually an unsolvable problem though, I would expect CarPlay & Android Auto would have a problem when you use your phone for navigation & start playing audio through USB. Maybe that's not enough traffic frequently enough to generate the noise needed to make it unusable, maybe the EE problem you were having was different, or maybe there's just good shielding in phones to avoid this as a problem.