This suggests that it will be used to penetrate enemy air space at low altitude presumably to launch attacks using internal weapons against ground based air defence networks.
The interesting thing would be when used against enemy air power it could fly at high altitude and use high speed supersonic performance to operate ahead of the aircraft it is supporting... now we know that US stealth works by deflecting radar waves away from where they are directed from to make them harder to track, but imagine a high flying aircraft directing radar signals down at them... those signals wont be reflected back up to the drones but might be reflected in the direction of the fighters the drones are supporting or vice versa when Su-35s and MiG-35s and Su-57s and A-100s are scanning for targets the high flying drones might catch reflections... certainly L band reflections might be triangulated with drones and Su-57s and Su-35s all detecting reflections might allow precise locations to be calculated and long range IIR guided missiles launched to intercept optically these radar evading targets.
Either way high altitude rather high speed drones launching missiles can get rather extra reach no matter what sort of missiles they launch meaning extra flight range for all types of missile whether it is current solid rocket motor powered missiles or near future scramjet powered hypersonic missiles...
The S-70 drone in question is clearly related to the Su-57 but seems to have rather bigger span area with only one engine so the internal volume should be rather good even without a super thick profile as shown by the above images of it sitting on a runway.