  A recent IEEE Access Paper by Gunn, Allison and Abbott (GAA) proposed a new
transient attack against the Kirchhoff-law-Johnson-noise (KLJN) secure key
exchange system. The attack is valid, but it is easy to build a defense for the
KLJN system. Here we note that GAA's paper contains several invalid statements
regarding security measures and the continuity of functions in classical
physics. These deficiencies are clarified in our present paper, wherein we also
emphasize that a new version of the KLJN system is immune against all existing
attacks, including the one by GAA.
