I assume they are referencing the fact that Oneweb's network architecture is based on 3GPP standards that allow the network to be operated with capabilities mat

I assume they are referencing the fact that Oneweb's network architecture is based on 3GPP standards that allow the network to be operated with capabilities matching those of terrestrial carrier-grade cores. There's in theory a lot less friction to using OneWeb for backhaul supporting 'off grid' LTE/5G RANs than there is using something like Starlink.