It almost certainly doesn't violate our understanding of thermodynamics, but it's not clear that it would have to in order to condense ambient water vapor from the atmosphere.
From the paper [1]:
Remarkably, when these amphiphilic nanoporous PINFs are exposed to high yet subsaturating conditions [i.e., relative humidity (RH) < 100%], macroscopic water droplets appear spontaneously on the film surfaces without the need for cooling, as illustrated in Fig. 1C and shown in Fig. 1D.