  Cho et al. [Phys. Rev. B, 84, 174502 (2011)] have reported on the temperature
dependence of the London penetration depth deduced from Tunnel Diode Oscillator
(TDO) measurements in optimally doped Fe(Se,Te) single crystals. According to
their analysis, these measurements chould suggest a nodeless two-gap pairing
symmetry with strong pair breaking effects. However, to reach this conclusion,
the authors fit the temperature dependence of the superfluid density with a two
band {\it clean} limit model which is incompatible with the presence of strong
pair breaking effects, deduced from the $T^n$ temperature dependence of the
London penetration depth below $T_c/3$. Moreover they claim that their results
are also ruling out the suggestion that surface conditions can significantly
affect the TDO data but this conclusion is based on one very specific damaging
process, and is completely ignoring the large dispersion in the previously
published TDO data.
