I interpreted him to mean physical collision risk. As for interference: They're planning on beaming signal to a wide swath of every plane for full-Earth covera

I interpreted him to mean physical collision risk. As for interference: They're planning on beaming signal to a wide swath of every plane for full-Earth coverage, not just at a narrow stretch near nadir. That means you'll have users acquiring a fix from a wide swath of sky; Let's say 45 degrees from zenith in various directions. That would make every user below 45 degrees latitude encounter fixes with OneWeb proximate to the geosynchronous belt on a regular basis. If spectral separation alone was insufficient to prevent interference, it's not something that would affect communications when a satellite is near the equator at all, it's something that would affect all the satellites nearly all the time. A 1200km orbit is 30x closer to Earth than the geosynchronous belt.