That medium bypass engine on the Il-76 testbed was spotted in 2023(assuming it even was the first test flight) if I remember correctly, it's foreseeable that engine could be certified and in LRIP by now considering most engines really only take 1-2 years between first flight and certification(Like GE90 took 14 months only from first flight to full certification and thats commercial as well with all the delays and emission/noise standards that probably doesn't matter for military engines). Especially considering that H-20 is due to take first flight in the next 18 months by the latest. As for engine cross sectional footprint, the testbed has tiny D-30KP engines with fan diameter of only ~1.05m judging by the test engine's size it could have a diameter of ~1.5m or so. It's quite likely it is small enough to be fitted into a UAV of this size.
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Take B-21 as an example, it uses two PW-9000 engines likely with similar dimensions and thrust as that new engine and it could fit into the "thinner" part of the fuselage beside the cockpit and behind the intake(Where you can see a small hump). It could have two engines mounted close together sharing a large central intake as a potential configuration due to the lack of a cockpit. This UAV with a likely MTOW similar to the B-21 is more easily powered by two 120kN class H-20 engines than two non-AB WS-10s with ~90kN each IMO.
I do not consider there to be particularly solid evidence that the Il-76 testbed was testing a new medium bypass engine which would be in an appropriate thrust class for a UAV like this.
Furthermore, even if it is testing a new medium bypass engine of appropriate thrust, it would be bold to think it would already be ready for application for a new large UAV like this.
... If anything I think people should already be content with the idea of this new large UAV being powered by two WS-10 variants -- it's always possible this thing is powered by a couple of turbojets.
I encourage everyone to appropriately set their expectations for the PRC serpentine industry and the PLA's appetite for serpentine risk.
You would think the recent news about J-20A and WS-10/15 would have taught everyone a lesson.