It's not the same thing at all. In a tunnel diode the tunneling takes place at the microscopic scale. It would be like holding a (very weak for safety!) alpha particle source in your hand. All those alpha particles being emitted tunnelled out of a nuclear potential but the tunnelling took place at the nuclear scale.
The difference here is that the size of the quantum system was, itself, macroscopic - the circuit that had quantized energy levels and showed tunnelling was macroscopic. This was a significant result although I struggle a bit to see it as being at the level of a Nobel prize but at least it's better than last year when they gave the physics prize to a computer scientist!