The novelty of the underlying paper notwithstanding, a quick scholar search for "gas diffusion electrodes ptfe copper" will show that this is hardly an unexplored space.
Indeed, this is at least a decade behind the state of the art for CO2 electroreduction and adding PTFE to gas diffusion electrodes is hardly a novel concept (see: H2 fuel cells which likely pre date it's inclusion in CO2 cells). It might be a good or even the best implementation of the concept, but if so it would be inches, not miles, better.