Meant more for western media oohhhs and Aaaaas than anything actually useful or cutting edge.
- Propulsion appears to be the usual, skewback screws (propellers) normally found on an Oscar class. The screws themselves look kind of small. Smaller screws must rotate faster at any given speed than a larger screw. Faster rotation means more bubbles, more cavitation and more noise, regardless of actual screw design. Surely the operational screws will be bigger. Nice touch covering them though, like it's something super duper secret. 
- Didn't even attempt a much quieter propulser. We and the Brits moved away from conventional screws on nuclear powered boats years ago. There's only so far you can go noise reduction wise with an exposed screw. The Russians outfitted a diesel-electric Kilo with a propulser some time ago. Borei class have them. Can't get it to work properly on a twin screw Oscar? So much for "research platform."
- The technology required for a truly stealthy, super fast, super extreme long range torpedo tipped with anything does not exist. Even for the US and China, who actually DO have deep pockets, it's still conceptual only. The technological hurdles are immense. But, but, but...it's got a nuclear warhead!!1!111!!!! So what. So did the old diesel Foxtrots the Soviets sorted during the Cuban Missile Crises.
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