It’s just a proof of concept engine, not even a prototype. Relax folks.
The fact that they can hit such high efficiency means that they can probably achieve higher output pretty easily too now. This is more a matter of design choices based on fit for applications than a matter of capability.This likely means the turbine either operates at higher temperatures or has better energy recuperation.
40% efficiency is quite high for a marine gas turbine. This is important news.
Still I would wish they tried to increase the power output a bit to make it more competitive with latest Western gas turbines.