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Although Pilch-Warner (PW) gravitational renormalization group flow [] passes a number of important consistency checks to be identified as a holographic dual to a large- N SU( N) $ \mathcal{N} $ = 2 supersymmetric gauge theory, it fails to reproduce the free energy of the theory on S, computed with the localization techniques. This disagreement points to the existence of a larger dual gravitational consistent truncation, which in the gauge theory flat-space limit reduces to a PW flow. Such truncation was recently identified by Bobev-Elvang-Freedman-Pufu (BEFP) []. Additional bulk scalars of the BEFP gravitation truncation might lead to destabilization of the finite-temperature deformed PW flows, and thus modify the low-temperature thermodynamics and hydrodynamics of $ \mathcal{N} $ = 2 plasma. We compute the quasinormal spectrum of these bulk scalar fields in the thermal PW flows and demonstrate that these modes do not condense, as long as the masses of the $ \mathcal{N} $ = 2 hypermultiplet components are real. [ABSTRACT FROM AUTHOR]